17. Lessons from Cold War: Détente to Afghanistan: Nixon, China, and a Changing Cold War

Détente: Can Cold War Enemies Learn to Live Together?

By the end of the 1960s, the United States and Soviet Union had spent more than two decades confronting one another across the globe. They had built enormous nuclear arsenals, supported opposing governments, competed for influence, and survived crises that sometimes brought the world frighteningly close to nuclear war. Yet something unexpected began to happen. Instead of preparing for the next confrontation, leaders in Washington and Moscow increasingly began asking whether two bitter enemies could remain rivals without constantly risking catastrophe. This easing of tensions became known as détente.

Living in the Shadow of Nuclear War

The Cuban Missile Crisis of 1962 had demonstrated how quickly a political confrontation could become a nuclear emergency. Meanwhile, the nuclear arms race was enormously expensive, and by the late 1960s both superpowers had reasons to explore negotiations. The United States was deeply involved in Vietnam, while the Soviet Union faced economic pressures and an increasingly serious rivalry with communist China. Neither side suddenly trusted the other, but both had something powerful in common: neither wanted a direct U.S.-Soviet war that might escalate into nuclear destruction.

A New Approach to an Old Enemy

When Richard Nixon became president in 1969, he and National Security Adviser Henry Kissinger pursued a more pragmatic relationship with Moscow. Their approach did not depend on the belief that the Soviet Union would abandon communism or become America's friend. Instead, Nixon and Kissinger believed agreements could be reached when American and Soviet interests overlapped. Nixon spoke of moving away from an era dominated by confrontation toward one emphasizing negotiation. The idea was simple but significant: enemies did not have to agree with one another in order to negotiate with one another.

From Threats to Negotiating Tables

One of the clearest signs of détente came when American and Soviet representatives began formal Strategic Arms Limitation Talks, known as SALT, in November 1969. Negotiations were difficult because each government feared giving the other a military advantage. Nevertheless, after more than two years of talks, Nixon traveled to Moscow in May 1972 and met Soviet leader Leonid Brezhnev. On May 26, they signed the Anti-Ballistic Missile Treaty and an interim strategic-arms agreement. For the first time in the Cold War, the two superpowers had agreed to negotiated limits on important parts of their nuclear arsenals.

Rivals Who Could Still Cooperate

Détente expanded beyond nuclear weapons. American and Soviet leaders discussed trade, science, technology, European security, and other areas where cooperation might benefit both countries. This created one of the Cold War's great contradictions: the United States and Soviet Union could remain ideological and military competitors while simultaneously negotiating agreements and expanding certain forms of cooperation. Détente was therefore not peace in the traditional sense. It was an attempt to manage competition before that competition became uncontrollable.

The Cold War Never Disappeared

Behind the handshakes and summit meetings, however, deep disagreements remained. Both governments continued building military power and pursuing influence abroad, and they did not necessarily understand détente in the same way. American officials debated whether Soviet actions around the world were compatible with genuine relaxation of tensions, while Soviet leaders continued pursuing their own strategic interests. Even supporters of détente did not claim that the rivalry had disappeared. The experiment was really about whether intense competition could exist alongside restraint and negotiation.

Could Enemies Really Learn to Live Together?

For a time, the answer appeared to be yes—but only under difficult conditions. Détente demonstrated that even governments separated by enormous ideological differences could negotiate when both believed cooperation served their interests. Yet it also exposed how fragile such cooperation could be. During the 1970s, every new crisis tested how much rivalry the relationship could withstand. The United States and Soviet Union had discovered that they could sit at the same table. The harder question was whether they could stay there—and by the end of the decade, events would push that experiment toward its breaking point.

The Sino-Soviet Split: When Communist Powers Become Rivals

During the early Cold War, American leaders often feared that communism was advancing as one enormous, united movement. The Soviet Union was the world's leading communist power, and after Mao Zedong's victory in China in 1949, the two countries became allies. Yet beneath the public displays of friendship were growing disagreements over leadership, ideology, nuclear weapons, foreign policy, and national interests. By the 1960s, the communist world's two most powerful nations were no longer simply disagreeing—they were becoming dangerous rivals.

An Alliance Begins to Crack

After Joseph Stalin died in 1953, Soviet leader Nikita Khrushchev began criticizing parts of Stalin's rule and pursued periods of reduced tension with the West. Mao strongly disagreed with important aspects of Khrushchev's approach and increasingly challenged Soviet leadership of the communist world. Other disputes added to the tension. China and the Soviet Union disagreed over international strategy, relations with the United States, and how communist revolutions should advance. Mao also pursued policies such as the Great Leap Forward that differed sharply from the Soviet model. The two governments shared communist ideology, but that did not erase their competing interests or disagreements about how communism should develop.

The Soviets Pack Their Bags

The argument soon had real consequences. The Soviet Union had provided China with technical assistance, industrial expertise, and help related to its early nuclear program. But cooperation deteriorated during the late 1950s. Moscow ended an important nuclear-cooperation agreement in 1959, and in 1960 the Soviet government withdrew its specialists from China. The sudden withdrawal damaged projects and deepened resentment in Beijing at a time when China was already experiencing severe economic difficulties following the Great Leap Forward. China nevertheless continued its nuclear program and successfully tested its first atomic bomb in 1964.

Communists Against Communists

By the early 1960s, the disagreement had become an open ideological struggle. Beijing accused Soviet leaders of abandoning revolutionary principles, while Moscow increasingly viewed Mao's policies as dangerous and disruptive. Both governments competed for influence among communist parties and developing nations around the world. The Cold War was becoming more complicated than a simple contest between a communist East and capitalist West. Communist countries could have their own rivalries, ambitions, territorial disputes, and interpretations of Marxism—and those disagreements could become just as bitter as conflicts with noncommunist countries.

The Border Explodes

Then the rivalry turned violent. China and the Soviet Union shared a border thousands of miles long, and disputes over parts of that frontier became increasingly dangerous. In March 1969, Chinese and Soviet forces fought around Zhenbao, or Damansky, Island on the Ussuri River. Additional clashes followed elsewhere along the frontier. Soldiers were killed on both sides, and the fighting intensified fears that the two communist giants might enter a much larger war. What had begun as disagreements between supposed allies had reached the point of armed conflict.

Washington Sees an Opportunity

The Sino-Soviet split dramatically changed Cold War strategy. President Richard Nixon and Henry Kissinger recognized that the United States no longer faced a completely unified communist bloc. Instead, Washington could potentially improve relations with China while negotiating separately with the Soviet Union. The hostility between Moscow and Beijing therefore helped create an opening for one of the Cold War's most surprising diplomatic developments: the United States, which had refused to maintain normal diplomatic relations with communist China for decades, began quietly reaching toward Beijing. Soon, an American president would travel there—and the balance of the Cold War would begin to change.

Nixon Goes to China: The Diplomatic Earthquake of 1972

On February 21, 1972, President Richard Nixon stepped onto Chinese soil and entered a country that no sitting American president had ever visited. For more than two decades, the United States and the People's Republic of China had been separated by hostility, ideological conflict, and the aftermath of the Chinese Civil War and Korean War. Yet Nixon, a Republican president known for his strong anti-communist record, had arrived in Beijing to meet China's communist leaders. His weeklong visit would become one of the Cold War's most dramatic diplomatic surprises.

A Journey That Began in Secret

The historic visit did not happen suddenly. Nixon's administration had quietly searched for ways to communicate with Beijing, sometimes sending messages through intermediaries such as Pakistan. Then, in July 1971, National Security Adviser Henry Kissinger secretly traveled to China, where he met Premier Zhou Enlai and helped prepare the way for Nixon. The secrecy was remarkable: Kissinger's trip was concealed from the public until Nixon announced on July 15 that he had accepted an invitation to visit China. A relationship frozen for decades was beginning to thaw.

Nixon Meets Mao

Only hours after arriving in Beijing on February 21, Nixon met Mao Zedong, the revolutionary leader who had helped establish the People's Republic of China in 1949. Nixon also held extensive discussions with Premier Zhou Enlai during the February 21–28 visit. The symbolism was extraordinary. These were leaders whose governments remained divided over communism, Taiwan, the Soviet Union, and America's role in Asia, yet they were now sitting together discussing world affairs. Neither government abandoned its political system or suddenly trusted the other. Instead, both recognized that changing international circumstances had given them reasons to talk.

The Soviet Union Watches Closely

Behind the meetings stood another Cold War giant: the Soviet Union. China and the Soviet Union had become bitter rivals, even fighting border clashes in 1969. Washington recognized that improved relations with Beijing could change the international balance of power. Moscow immediately paid attention; after Nixon returned, Soviet Ambassador Anatoly Dobrynin questioned Kissinger about what had occurred in China. Nixon's opening to Beijing was therefore much more than a meeting between two countries—it complicated the Cold War by creating a triangular relationship among Washington, Moscow, and Beijing.

The Shanghai Communiqué

Near the end of Nixon's trip, the two governments issued the Shanghai Communiqué on February 27. What made the document unusual was that it openly acknowledged important disagreements rather than pretending they had disappeared. The Taiwan question remained especially difficult. The United States stated that it acknowledged the position held by Chinese on both sides of the Taiwan Strait that there was one China and Taiwan was part of China, while emphasizing its interest in a peaceful settlement. At the same time, both governments agreed to continue working toward improved relations and greater contact. It was not a complete normalization of relations, but it created an important foundation for what followed.

A Handshake That Changed the Cold War

When Nixon left China on February 28, the United States and People's Republic of China were not suddenly allies, and full diplomatic relations would not arrive until 1979. Nevertheless, something fundamental had changed. Two governments that had spent decades largely isolated from one another had demonstrated that bitter Cold War rivals could negotiate when their interests overlapped. The opening also affected the wider strategic environment and U.S.-Soviet détente. Nixon would soon travel to Moscow as well, placing the United States in the remarkable position of improving relations with both of the world's major communist powers. The Cold War had not ended, but its diplomatic map had been dramatically redrawn.

Nixon Goes to Moscow: SALT I and Controlling the Nuclear Competition

On May 22, 1972, President Richard Nixon arrived in Moscow for a summit that would have seemed almost unimaginable during some of the darkest years of the Cold War. Only three months earlier, Nixon had made his historic journey to communist China. Now he was meeting Soviet leader Leonid Brezhnev inside the Kremlin. The United States and Soviet Union remained heavily armed rivals, but their leaders were attempting something new: instead of simply building more weapons than the other side, they would try to negotiate limits on the nuclear competition.

An Arms Race With Terrifying Stakes

By the late 1960s, both superpowers possessed enormous nuclear forces capable of devastating the other. The Soviet Union had rapidly expanded its intercontinental ballistic missile forces, while both countries were developing increasingly sophisticated offensive and defensive systems. A particularly difficult problem involved anti-ballistic missile systems, or ABMs, designed to intercept incoming nuclear missiles. If one side believed it could defend itself after launching a first strike, the already dangerous nuclear balance might become even less stable. American and Soviet leaders therefore had a powerful reason to explore whether limits could make their rivalry more predictable.

Two and a Half Years at the Negotiating Table

Formal Strategic Arms Limitation Talks, better known as SALT, began in Helsinki, Finland, on November 17, 1969. Negotiations continued for roughly two and a half years as diplomats struggled over ABM defenses, intercontinental ballistic missiles, submarine-launched missiles, verification, and other complicated questions. Neither government wanted to surrender an advantage or allow the other to secretly race ahead. Progress was slow, but by 1972 enough compromises had emerged for Nixon and Brezhnev to prepare for a historic agreement.

The Kremlin Summit

Nixon and Brezhnev met during the Moscow summit of May 22–29, discussing arms control as well as the broader relationship between their countries. The meeting was especially remarkable because serious Cold War conflicts had not disappeared. The Vietnam War was still raging, and Washington and Moscow continued supporting opposing interests around the world. Nevertheless, the two governments concluded that cooperation in certain areas could serve both of their interests. The summit produced agreements involving not only strategic weapons but also science, health, environmental issues, space cooperation, and other subjects.

SALT I Changes the Rules

On May 26, Nixon and Brezhnev signed two major arms-control agreements. The Anti-Ballistic Missile Treaty placed restrictions on ABM defenses, while the Interim Agreement limited certain strategic offensive missile launchers. These agreements did not destroy existing nuclear arsenals, eliminate nuclear weapons, or end the arms race. They also left important categories of weapons outside the limits. Yet SALT I represented a major change: Washington and Moscow had accepted formal restrictions on significant parts of their strategic competition and established a foundation for additional negotiations.

Enemies Trying to Control the Competition

SALT I revealed both the promise and the limitations of détente. Nixon and Brezhnev had not become friends, and neither government abandoned its military power or political ambitions. Instead, both recognized that an uncontrolled nuclear competition carried enormous costs and risks. The Moscow summit demonstrated that Cold War enemies could negotiate without ending their rivalry. But SALT I was only a beginning. The superpowers still possessed enough nuclear weapons to cause unimaginable destruction, and new technologies would soon complicate efforts to control them. The question was no longer simply whether the United States and Soviet Union could reach an agreement—it was whether détente could survive the conflicts that were still spreading around the world.

Détente Beyond Nixon: Ford, Helsinki, Carter, and SALT II

When Richard Nixon resigned from the presidency in August 1974, détente did not disappear with him. His successor, Gerald Ford, continued negotiations with the Soviet Union, while Jimmy Carter later attempted to combine arms control with a stronger emphasis on human rights. Throughout the second half of the 1970s, American and Soviet leaders continued searching for ways to control their dangerous rivalry. Yet beneath the summit meetings and treaties, disagreements were growing that would eventually place détente under enormous strain.

Ford Takes Over the Cold War

Gerald Ford inherited a complicated relationship with Soviet leader Leonid Brezhnev. Rather than abandoning Nixon's policies, Ford initially continued détente and kept Henry Kissinger as secretary of state. In November 1974, Ford and Brezhnev met at Vladivostok in the Soviet Union and reached a broad framework for a future SALT II agreement. The goal was to go beyond the earlier SALT I agreements and establish additional limits on strategic nuclear forces. But technical disputes, disagreements over weapons systems, and growing political opposition inside the United States made a final agreement difficult to achieve during Ford's presidency.

Helsinki and an Agreement Across Europe

One of détente's most important moments came in August 1975, when Ford joined leaders from the Soviet Union, Canada, and European nations in signing the Helsinki Final Act. The agreement addressed European security, cooperation, borders, and principles involving human rights and fundamental freedoms. At the time, critics in the United States worried that Helsinki appeared to accept the postwar territorial situation in Eastern Europe. Yet its human-rights provisions would also become significant because activists could point to promises communist governments themselves had signed. Détente was beginning to involve not merely missiles and armies, but questions about how governments treated their own citizens.

Carter Brings Human Rights Into the Debate

Jimmy Carter entered the White House in January 1977 with a somewhat different vision of American foreign policy. He still supported arms control and negotiations with Moscow, but his administration gave greater attention to human rights. Carter believed the United States could criticize abuses inside the Soviet Union while still negotiating agreements with Soviet leaders. This created new tensions because Moscow regarded American criticism of Soviet domestic policies as interference. Carter therefore faced a difficult challenge: continue détente without remaining silent about political repression.

SALT II: Another Attempt to Control the Nuclear Race

Years of negotiations finally produced SALT II. Carter and Brezhnev met in Vienna in June 1979 and signed the treaty on June 17. SALT II established an overall limit of 2,250 strategic nuclear delivery vehicles for each superpower and included additional restrictions involving strategic forces and multiple-warhead systems. But signing a treaty was not enough in the American constitutional system—the U.S. Senate still had to provide its advice and consent before ratification. Opposition was already significant, with critics questioning Soviet behavior, the military balance, and whether the agreement could be adequately verified.

Détente Approaches the Breaking Point

By the end of 1979, détente was in serious trouble. The United States and Soviet Union had demonstrated that enemies could negotiate arms limitations, discuss European security, and cooperate in certain areas while remaining political and military rivals. But conflicts elsewhere continued, mistrust remained deep, and SALT II faced a difficult fight in Washington. Then, in December 1979, Soviet forces entered Afghanistan. Carter soon asked the Senate to delay consideration of SALT II, and the treaty was never ratified. The era that had begun with hopes of managing the Cold War through negotiation was giving way to renewed confrontation—and Afghanistan would become the crisis that dramatically accelerated that change.

Détente Begins to Break Down

During the early 1970s, American and Soviet leaders had shaken hands, signed arms agreements, and spoken about reducing Cold War tensions. Yet détente had never ended the struggle between the superpowers. By the middle and late 1970s, events around the world increasingly revealed just how fragile the relationship remained. Washington and Moscow disagreed over military power, human rights, communist expansion, and conflicts in developing nations. The Cold War had become less confrontational in some places, but it certainly had not disappeared.

Two Different Ideas of Détente

One major problem was that the United States and Soviet Union did not always understand détente in the same way. American leaders hoped arms agreements and improved relations might encourage Soviet restraint internationally. Soviet leaders sought recognition as an equal superpower but did not believe détente required them to abandon competition with the United States around the world. Consequently, the two nations could negotiate nuclear limitations in one room while supporting opposing governments and movements thousands of miles away. As those contradictions became more visible, American confidence in détente weakened.

Africa Becomes Another Test

Conflicts in Africa placed enormous pressure on the relationship. During the Angolan Civil War, the Soviet Union supplied the communist-aligned MPLA while Cuba sent military forces to support it; the United States backed rival forces, while South Africa also intervened against the MPLA. Another crisis developed in the Horn of Africa in 1977–1978, where Soviet and Cuban involvement supporting Ethiopia during the Ogaden War alarmed Washington. Some Carter administration officials increasingly questioned whether the United States could pursue détente with Moscow while Soviet power and influence were expanding in conflicts elsewhere.

Human Rights Create a New Battle

President Jimmy Carter introduced another source of tension when he made human rights an important part of American foreign policy. His administration publicly raised concerns about political repression and dissidents inside the Soviet Union and Eastern Europe. Soviet leaders regarded these criticisms as interference in their internal affairs. Carter nevertheless argued that the United States could support human rights while continuing negotiations over nuclear weapons. The result was another difficult contradiction: Washington wanted cooperation with Moscow while simultaneously criticizing aspects of Soviet rule that Moscow considered none of America's business.

Arguments Inside Washington

Americans also disagreed over how the Soviet Union should be handled. Carter's national security adviser, Zbigniew Brzezinski, increasingly favored a tougher response to Soviet actions abroad, while Secretary of State Cyrus Vance generally placed greater emphasis on diplomacy and protecting arms-control negotiations. These disagreements reflected a larger national debate. Was détente actually restraining Soviet behavior, or was Moscow benefiting from negotiations while continuing to expand its influence? Even as Carter and Soviet leader Leonid Brezhnev signed SALT II in June 1979, the larger relationship was becoming increasingly troubled.

The Cracks Become a Break

By late 1979, détente was already badly weakened. Disputes over Africa, human rights, military competition, and Soviet-American intentions had steadily eroded trust. Yet the event that transformed those cracks into a much deeper confrontation was still coming. In December 1979, Soviet troops entered Afghanistan. The invasion shocked Washington and dramatically changed Carter's approach toward Moscow. After years of attempting to manage the Cold War through negotiation, the United States and Soviet Union were moving toward a renewed period of confrontation—and Afghanistan would become one of its most important battlefields.

The Soviet Invasion of Afghanistan and the End of Détente (1979–1980)

In December 1979, Soviet troops poured into Afghanistan, transforming a growing Afghan civil conflict into one of the Cold War's most consequential confrontations. For years, American and Soviet leaders had tried to control their rivalry through détente, summit meetings, and arms negotiations. Now Soviet soldiers were entering a country beyond the Soviet-led Eastern European bloc, and Washington feared that Moscow had taken a major new step in expanding its military power. The invasion severely damaged an already troubled U.S.-Soviet relationship and helped bring the era of détente to an end.

Afghanistan Falls Into Revolution

The crisis had begun before Soviet troops crossed the border. In April 1978, Afghanistan's communist People's Democratic Party of Afghanistan seized power in the Saur Revolution, killing President Mohammed Daoud Khan and establishing a new government. Communist leaders attempted sweeping reforms, but their government encountered armed resistance, particularly in rural and religious communities. Internal struggles also tore apart the ruling party. In 1979, Hafizullah Amin emerged as Afghanistan's leader after his rival Nur Muhammad Taraki was removed and killed. Meanwhile, an expanding insurgency threatened the communist government's survival, leaving Moscow increasingly concerned that it could lose an important neighboring state.

Soviet Troops Move In

On December 25, 1979, Soviet forces began entering Afghanistan in large numbers, with additional ground forces crossing the border soon afterward. Soviet troops and special units seized important positions in Kabul, and on December 27 forces attacked the presidential palace and killed Amin. Moscow then supported Babrak Karmal as Afghanistan's new leader. Soviet officials maintained that their forces had entered at the request of Afghanistan's government to provide assistance, but the Carter administration rejected that explanation, pointing to the Soviet role in overthrowing Amin and installing a new government.

Washington Responds

President Jimmy Carter reacted forcefully. His administration imposed economic measures against the Soviet Union, restricted technology exports, curtailed grain sales, increased assistance to Afghan resistance forces, and supported a boycott of the 1980 Summer Olympics in Moscow. The invasion also dealt a devastating blow to SALT II, the nuclear arms agreement Carter and Soviet leader Leonid Brezhnev had signed only months earlier. Carter asked the Senate to delay consideration of the treaty, and it was never ratified. The promise that détente might steadily produce a more cooperative superpower relationship was rapidly disappearing.

The Carter Doctrine

Afghanistan's location made the invasion especially alarming to American policymakers because it brought Soviet military forces closer to Iran, Pakistan, and the Persian Gulf. In his January 1980 State of the Union address, Carter announced the policy that became known as the Carter Doctrine. He declared that an attempt by an outside power to gain control of the Persian Gulf region would be regarded as an attack on vital American interests and could be resisted with military force. Afghanistan had transformed from a distant crisis into a central issue in American Cold War strategy.

A New and Deadly Phase of the Cold War

The Soviet leadership had intervened hoping to preserve a friendly communist government, but Afghanistan instead became a long and costly war. Afghan resistance fighters, commonly called the mujahideen, continued fighting Soviet and Afghan government forces, while outside countries increasingly became involved in supporting the resistance. Soviet troops would remain in Afghanistan until 1989. For the broader Cold War, December 1979 represented a dramatic turning point: arms-control negotiations and summit diplomacy gave way to renewed military competition and suspicion. Détente had not survived the decade, and as the 1980s began, the United States and Soviet Union were entering another dangerous period of confrontation.

Global Events That Shaped Détente, China, and the Changing Cold War

The Birth of Bangladesh and the India-Pakistan War — 1971

A political crisis in East Pakistan exploded into rebellion, mass displacement, and eventually war between India and Pakistan. India supported the Bengali independence movement, while Pakistan was important to Nixon because its government was helping the United States secretly communicate with China. At the same time, India signed a friendship treaty with the Soviet Union, while China had close relations with Pakistan. When war erupted in December 1971, the crisis therefore became entangled with the larger Cold War. Pakistan's defeat resulted in East Pakistan becoming the independent nation of Bangladesh. The conflict demonstrated exactly why Nixon and Kissinger wanted flexible diplomacy: regional wars could suddenly involve Washington, Moscow, and Beijing at the same time.

China Takes Its Seat at the United Nations — 1971

Another major international change occurred just months before Nixon traveled to China. In October 1971, the United Nations voted to recognize representatives of the People's Republic of China as China's representatives at the UN, replacing the Republic of China government on Taiwan in China's UN seat, including its permanent Security Council position. The United States had supported admitting the People's Republic while trying unsuccessfully to prevent Taiwan's expulsion. The vote demonstrated China's growing diplomatic importance and reinforced the reality confronting Washington: the People's Republic could no longer simply be isolated from the international system.

The Yom Kippur War Nearly Tests Détente to Destruction — 1973

On October 6, 1973, Egypt and Syria launched a surprise attack against Israel. The United States supplied Israel, while the Soviet Union had supplied major Arab partners, turning the war into a dangerous test of superpower relations. As the fighting approached its conclusion, Soviet leader Leonid Brezhnev raised the possibility of Soviet action connected to enforcing the ceasefire. The United States responded by placing its forces on heightened nuclear alert. The crisis eventually subsided, but it brought the superpowers dangerously close to confrontation. Détente had survived—but the war demonstrated that agreements signed in Moscow could be threatened by events occurring thousands of miles away.

The Oil Embargo Changes the Balance of Economic Power — 1973–1974

The Yom Kippur War produced another international shock. Arab oil producers imposed an embargo against the United States and some other countries while cutting production. Oil prices rose dramatically, contributing to inflation and economic disruption in the United States and other industrialized nations. The crisis demonstrated that global power was no longer controlled solely by Washington and Moscow. Oil-producing countries could influence the economies and foreign policies of much larger military powers. Energy security consequently became an increasingly important part of American strategy, especially in the Middle East and Persian Gulf.

Portugal's Revolution Reshapes Africa — 1974–1975

In April 1974, a military coup known as the Carnation Revolution overthrew Portugal's authoritarian government. Portugal's new leaders moved toward ending the country's colonial wars, accelerating independence for territories including Angola and Mozambique. In Angola, however, competing independence movements soon fought for control. The Soviet Union and Cuba supported the Marxist MPLA, while the United States covertly supported rival forces; South Africa and Zaire also became involved. The Angola crisis became especially important to détente because Americans increasingly questioned how the Soviet Union could promote cooperation with Washington while supporting revolutionary movements and allies in conflicts elsewhere.

China, Vietnam, and Cambodia Reshape the Communist World — 1975–1979

Events in Southeast Asia further demonstrated that communist governments were not automatically allies. After communist victories in Vietnam and Cambodia in 1975, relations among China, Vietnam, Cambodia, and the Soviet Union became increasingly complicated. Vietnam moved closer to Moscow while China supported the Khmer Rouge government in Cambodia. Vietnam invaded Cambodia in late 1978 and overthrew the Khmer Rouge regime. China then attacked northern Vietnam in February 1979 before withdrawing its forces weeks later. American officials regarded the conflict as another major episode in the Sino-Soviet struggle because Vietnam was closely aligned with Moscow. The fighting reinforced Washington's realization that the communist world had fractured into competing centers of power.

The United States and China Establish Full Diplomatic Relations — 1979

Nixon's 1972 trip to China opened the door, but President Jimmy Carter completed another major step. On January 1, 1979, the United States and People's Republic of China formally established diplomatic relations. Washington recognized the People's Republic government as the sole legal government of China while maintaining unofficial relations with Taiwan. Deng Xiaoping visited the United States weeks later. The development strengthened the strategic triangle connecting Washington, Beijing, and Moscow and showed that the opening begun under Nixon had become a lasting transformation of American foreign policy rather than simply a temporary diplomatic experiment.

The People Who Shaped Détente and the Changing Cold War (1969–1980)

Richard Nixon (1913–1994) — President Who Pursued Détente

Richard Nixon served as president of the United States from 1969 until his resignation in 1974. Although he had built much of his earlier political career as a strong anti-communist, as president he increasingly approached foreign affairs through strategic national interests and balances of power. Nixon opened relations with the People's Republic of China, traveled to Beijing in 1972, met Mao Zedong and Zhou Enlai, and then traveled to Moscow to meet Leonid Brezhnev. His administration pursued détente with the Soviet Union and negotiated SALT I and the Anti-Ballistic Missile Treaty. Nixon's presidency ended because of the Watergate scandal, but the diplomatic changes begun during his administration continued long after he left office.

Henry Kissinger (1923–2023) — Architect of Realpolitik

Born in Germany to a Jewish family that fled Nazi persecution, Henry Kissinger eventually became one of America's most influential Cold War diplomats. He served as Nixon's national security adviser and later as secretary of state under Nixon and Gerald Ford. Kissinger helped develop the administration's strategy of triangular diplomacy, using America's relationships with China and the Soviet Union to influence each communist power's calculations. His secret 1971 journey to China helped prepare Nixon's historic visit, while his negotiations with Soviet officials contributed to détente and arms-control diplomacy. His policies remain debated, particularly regarding U.S. actions in Southeast Asia and elsewhere, but his influence on 1970s diplomacy was substantial.

Mao Zedong (1893–1976) — China's Revolutionary Leader

Mao Zedong had led the Chinese Communist Revolution and became the dominant leader of the People's Republic of China after its establishment in 1949. By the late 1960s, however, China's relationship with the Soviet Union had deteriorated so severely that Chinese and Soviet troops fought along their border. Mao recognized that improved relations with the United States could strengthen China's position against Moscow. His 1972 meeting with Nixon became one of the defining images of the changing Cold War. Mao remained China's paramount leader until his death in 1976, after which China's leadership gradually moved in a more pragmatic direction.

Zhou Enlai (1898–1976) — The Diplomat Who Helped Open China

Premier Zhou Enlai was one of the most important diplomatic figures in communist China. A veteran revolutionary who had worked alongside Mao for decades, Zhou played a central role in China's foreign relations. He met secretly with Kissinger in 1971 and then conducted extensive discussions with Nixon during the president's 1972 visit. Zhou's diplomacy helped produce the Shanghai Communiqué, which acknowledged major disagreements between China and the United States while establishing a framework for improving relations. His ability to negotiate with a country that China had treated as an enemy helped reshape the strategic balance of the Cold War.

Leonid Brezhnev (1906–1982) — Leader of the Soviet Superpower

Leonid Brezhnev dominated Soviet politics through most of this period, serving as Communist Party leader from 1964 until 1982. Under Brezhnev, the Soviet Union achieved approximate strategic nuclear parity with the United States and simultaneously pursued détente. He negotiated with Nixon, Ford, and Carter and participated in agreements including SALT I, the Helsinki process, and SALT II. Yet the Soviet Union also supported communist governments and movements abroad. The Soviet invasion of Afghanistan in December 1979 badly damaged détente; Carter warned Brezhnev that the action could mark a fundamental and lasting turning point in relations between the two superpowers.

Gerald Ford (1913–2006) — Keeping Détente Alive

Gerald Ford became president following Nixon's resignation in August 1974 and inherited both détente and its growing problems. Ford retained Kissinger as secretary of state and continued negotiating with Brezhnev. His administration participated in the Helsinki process, culminating in the Helsinki Final Act of 1975, which addressed European security, borders, cooperation, and human rights. Ford's presidency demonstrated that détente was not simply Nixon's personal policy; it had become a broader strategy for managing relations with the Soviet Union. Yet criticism of détente was growing inside the United States as conflicts continued elsewhere in the world.

Golda Meir (1898–1978) — Israel's Prime Minister During the 1973 War

Born in Kyiv and raised partly in the United States, Golda Meir became prime minister of Israel in 1969. Her leadership became internationally significant when Egypt and Syria attacked Israel in October 1973 during the Yom Kippur War. The United States supported Israel while the Soviet Union supported important Arab partners, bringing the superpowers into a dangerous confrontation despite détente. Meir communicated directly with Nixon and Kissinger during this period. The war demonstrated how a regional conflict could suddenly threaten the broader U.S.-Soviet relationship and helped lead to Kissinger's subsequent Middle Eastern diplomacy.

Indira Gandhi (1917–1984) — India Becomes a Major Cold War Player

Indira Gandhi, daughter of Indian independence leader Jawaharlal Nehru, served as India's prime minister during most of this period. Her government became particularly important during the 1971 crisis between India and Pakistan that resulted in the creation of Bangladesh. India had signed a treaty of friendship and cooperation with the Soviet Union, while Pakistan maintained important relationships with China and the United States. Gandhi's India therefore became a major factor in the complicated balance among Washington, Moscow, and Beijing. When Soviet forces later entered Afghanistan, Gandhi criticized foreign intervention but also opposed turning South Asia into another arena of superpower confrontation.

Jimmy Carter (1924–2024) — Human Rights, SALT II, and Afghanistan

Jimmy Carter became president in 1977 and attempted to continue arms-control negotiations while giving human rights a more prominent place in American foreign policy. His administration completed the establishment of formal diplomatic relations with the People's Republic of China in 1979. Carter and Brezhnev also signed SALT II that year. Then came two enormous crises: the Iranian hostage crisis and the Soviet invasion of Afghanistan. Carter responded to the invasion with sanctions, restrictions on technology exports, a grain embargo, increased assistance to Afghan insurgents, and the U.S.-led boycott of the 1980 Moscow Olympics. SALT II was never ratified by the Senate.

Deng Xiaoping (1904–1997) — China Takes a New Direction

After Mao's death, Deng Xiaoping gradually emerged as China's most influential leader. Unlike Mao, Deng increasingly emphasized economic modernization and practical results. His rise coincided with the next major step in the American-Chinese relationship. On January 1, 1979, the United States and People's Republic of China formally established diplomatic relations, completing a process that had begun under Nixon. Deng's subsequent visit to the United States symbolized how dramatically relations had changed since the hostility of the early Cold War. China's growing independence from Moscow also made the Cold War increasingly a three-power strategic contest rather than a simple division between two unified blocs.

Zbigniew Brzezinski (1928–2017) — Carter's Hard-Line Strategist

Polish-born Zbigniew Brzezinski served as Carter's national security adviser and became an influential voice arguing that Soviet expansion had to be resisted. He was particularly concerned about Soviet influence across the region stretching from the Middle East through Central and South Asia. During the political upheaval in Afghanistan, Brzezinski advocated a tougher approach than some other Carter administration officials. After the Soviet invasion, his arguments gained greater influence as Washington increased assistance to Afghan insurgents and adopted a more confrontational approach toward Moscow.

Life Lessons and Ways of Thinking We Can Learn from Détente to Afghanistan

Your Opponent Does Not Always Have to Be Your Enemy

One of the most useful lessons of détente is that disagreement does not make communication impossible. The United States and Soviet Union possessed opposing political systems and competed around the world, yet their governments negotiated arms-control agreements because both had reasons to reduce the danger of nuclear war. Students can apply this principle to everyday conflicts. Two people can strongly disagree while still searching for areas where their interests overlap. Cooperation does not require agreement about everything.

Understand What the Other Side Wants

The diplomacy of Richard Nixon and Henry Kissinger demonstrates the importance of examining a situation from several perspectives. American officials recognized that China feared Soviet power and that the Soviet Union was concerned about improving relations between Washington and Beijing. This helped the United States pursue what became known as triangular diplomacy. Students studying strategy should therefore ask not only, "What do I want?" but also, "What does the other person want, what are they worried about, and what choices do they believe they have?" Understanding another person's interests does not mean agreeing with them; it provides information needed to make better decisions.

Relationships Can Change

Perhaps one of the most surprising lessons of the period is how quickly international relationships can change. Communist China and the Soviet Union had once been allies, yet by 1969 their forces had fought along their border. Meanwhile, the United States and China had spent decades in hostility before Nixon traveled to Beijing in 1972. History repeatedly demonstrates that today's rival may become tomorrow's negotiating partner, while today's ally may eventually become a competitor. Students should therefore be careful about assuming that present circumstances will continue forever.

Sometimes Talking Is a Form of Strength

Negotiation can mistakenly be viewed as surrender, but détente demonstrates that negotiation can also be strategic. Nixon traveled to Moscow and negotiated SALT I while the United States maintained enormous military power. Soviet leaders negotiated while maintaining their own forces. Neither side had to trust the other completely before beginning discussions. Successful negotiation often depends on clearly understanding what cannot be compromised, identifying what can be negotiated, and creating ways to verify whether agreements are being followed.

Success Can Contain the Seeds of Future Problems

Students should resist viewing historical events as simply successes or failures. SALT I placed limits on parts of the strategic nuclear competition, but it did not eliminate nuclear weapons or end the arms race. Nixon's opening to China dramatically changed international diplomacy, but it did not resolve every disagreement between Washington and Beijing. Détente reduced certain tensions while competition continued elsewhere. Good historical thinking therefore requires asking two questions at once: "What problem did this decision solve?" and "What problems did it leave behind?"

Vocabulary to Learn While Studying Nixon, China, and a Changing Cold War

1. DétenteDefinition: A French word meaning a relaxation of tensions, used to describe improved relations between the United States and Soviet Union during much of the 1970s.Sample Sentence: Détente encouraged American and Soviet leaders to negotiate rather than allow every disagreement to become a major confrontation.

2. RealpolitikDefinition: A foreign-policy approach based primarily on practical national interests and power relationships rather than ideology alone.Sample Sentence: Nixon and Kissinger used realpolitik when they improved relations with communist China despite major ideological differences.

3. Triangular DiplomacyDefinition: The strategy of managing relationships among the United States, Soviet Union, and China by taking advantage of their competing interests.Sample Sentence: Triangular diplomacy allowed the United States to improve relations with both China and the Soviet Union.

4. RapprochementDefinition: The restoration or improvement of friendly relations between countries after a period of hostility.Sample Sentence: Nixon's 1972 visit to China became an important step toward rapprochement between the United States and China.

5. Shanghai CommuniquéDefinition: The 1972 diplomatic statement issued during Nixon's visit to China that acknowledged disagreements while establishing a framework for improving U.S.-Chinese relations.Sample Sentence: The Shanghai Communiqué helped create a foundation for greater communication between Washington and Beijing.

6. Strategic Arms Limitation Talks (SALT)Definition: Negotiations between the United States and Soviet Union intended to place limits on certain strategic nuclear weapons and delivery systems.Sample Sentence: The SALT negotiations represented an attempt to control parts of the dangerous nuclear competition.

7. SALT IDefinition: A group of U.S.-Soviet arms-control agreements concluded in 1972 that included limits involving strategic offensive weapons and anti-ballistic missile systems.Sample Sentence: SALT I demonstrated that the superpowers could negotiate limits even while remaining Cold War rivals.

8. Anti-Ballistic Missile (ABM)Definition: A missile designed to intercept and destroy an incoming ballistic missile.Sample Sentence: The United States and Soviet Union agreed to restrict ABM systems as part of their effort to stabilize the nuclear balance.

9. SALT IIDefinition: A 1979 U.S.-Soviet treaty intended to place additional limits on strategic nuclear forces; it was signed but never ratified by the United States.Sample Sentence: President Carter and Leonid Brezhnev signed SALT II shortly before U.S.-Soviet relations deteriorated sharply.

10. Helsinki AccordsDefinition: Agreements signed in 1975 by the United States, Canada, the Soviet Union, and European countries addressing European security, cooperation, borders, and human rights principles.Sample Sentence: Dissidents later used the human-rights principles of the Helsinki Accords to challenge communist governments.

11. Human RightsDefinition: Fundamental freedoms and protections considered to belong to all people, such as freedom of belief and protection from arbitrary imprisonment.Sample Sentence: President Carter made human rights an important part of American foreign policy.

12. DissidentDefinition: A person who publicly challenges or opposes the policies or practices of a government or established authority.Sample Sentence: Soviet dissidents called attention to restrictions on political expression and other human-rights issues.

13. NormalizationDefinition: The process of establishing or restoring normal diplomatic relations between countries.Sample Sentence: The United States and People's Republic of China completed diplomatic normalization in 1979.

14. EmbargoDefinition: A government restriction or prohibition placed on trade with another country, often for political or economic reasons.Sample Sentence: The Carter administration imposed restrictions on trade with the Soviet Union after the invasion of Afghanistan.

15. SanctionsDefinition: Economic or political penalties imposed on a country in an attempt to influence its actions.Sample Sentence: The United States adopted economic measures against the Soviet Union following its intervention in Afghanistan.

16. MujahideenDefinition: A term meaning those who engage in jihad; during the Soviet-Afghan War, it commonly referred to various Afghan Muslim resistance groups fighting the Soviet-backed Afghan government and Soviet forces.Sample Sentence: Different mujahideen groups fought Soviet and Afghan government forces during the war in Afghanistan.

17. Carter DoctrineDefinition: President Jimmy Carter's 1980 declaration that the United States regarded an outside power's attempt to gain control of the Persian Gulf region as a threat to vital American interests.Sample Sentence: The Carter Doctrine reflected growing American concern about Soviet power following the invasion of Afghanistan.

18. BoycottDefinition: A deliberate refusal to participate in or use something as a form of protest.Sample Sentence: The United States led a boycott of the 1980 Moscow Olympics in response to the Soviet invasion of Afghanistan.

Activities to Try While Studying Nixon, China, and a Changing Cold War

Washington, Moscow, Beijing: The Triangle of Power

Recommended Age: 12–18

Activity Description: Students recreate the strategic triangle among the United States, Soviet Union, and China following the Sino-Soviet split. Each team must decide whether cooperation or confrontation with the other powers best protects its interests.

Objective: Demonstrate how the Sino-Soviet split changed Cold War diplomacy and contributed to Nixon's decision to improve relations with China.

Materials: Three country signs, string or yarn, index cards, pencils, and country objective sheets.

Instructions: Place three signs around the room representing Washington, Moscow, and Beijing. Divide students among the three countries and provide each group with objectives based on the period. China is concerned about Soviet power but remains suspicious of America. The Soviet Union wants to prevent closer U.S.-Chinese cooperation. The United States wants to improve its strategic position with both. Allow several rounds of negotiations. After each round, connect cooperating countries with string. Discuss how one new relationship can alter the decisions of everyone else.

Learning Outcome: Students understand triangular diplomacy and discover why communist China and the Soviet Union could become rivals despite sharing important ideological similarities.

Build the Changing Cold War Timeline

Recommended Age: 8–14

Activity Description: Students construct a visual timeline showing how quickly international relations changed between 1969 and 1980.

Objective: Help students understand chronology and recognize connections among détente, China, arms control, international crises, and Afghanistan.

Materials: Poster paper or long roll of paper, markers, index cards, tape, and optional printed photographs.

Instructions: Create a timeline beginning in 1969 and ending in 1980. Assign students events such as the Sino-Soviet border clashes, Kissinger's secret China trip, Nixon's China visit, SALT I, Nixon's Moscow summit, the 1973 Arab-Israeli War, Helsinki Accords, Carter's presidency, normalization with China, SALT II, Iranian Revolution, and Soviet invasion of Afghanistan. Students write a short description for each event and place it on the timeline. Then use arrows to connect events that influenced one another.

Learning Outcome: Students recognize that historical events occur as interconnected developments rather than isolated facts.

December 1979: The Afghanistan Decision

Recommended Age: 13–18

Activity Description: Students examine the Soviet invasion of Afghanistan from several contemporary perspectives and then debate possible responses.

Objective: Teach students about the collapse of détente while developing perspective-taking and evidence-based reasoning.

Materials: World map, Afghanistan background sheet, role cards representing American, Soviet, Afghan government, Afghan resistance, Pakistani, and Chinese perspectives, paper, and pencils.

Instructions: Explain Afghanistan's political instability leading into December 1979. Assign students different perspectives and provide each with historically grounded interests and concerns. Students explain how their assigned government or group might interpret Soviet military intervention. The American group must then consider possible responses including sanctions, diplomatic pressure, assistance to Afghan resistance forces, Olympic boycott, or continued negotiations. Finish by comparing their proposals with actions actually taken by the Carter administration.

Learning Outcome: Students understand why Afghanistan became a major international crisis and why the Soviet intervention severely damaged U.S.-Soviet détente.

The Cold War Newspaper: 1980

Recommended Age: 10–18

Activity Description: Students create a newspaper dated 1980 explaining how dramatically the Cold War has changed since 1969.

Objective: Encourage students to combine information from throughout the chapter while practicing historical writing, summarization, and analysis.

Materials: Paper, pencils, markers, ruler, research materials, and optional computer publishing software.

Instructions: Have students create a front page containing several historically appropriate stories. Possible headlines could cover U.S.-China relations, SALT II, Afghanistan, the Moscow Olympics boycott, the Iranian Revolution, or deteriorating U.S.-Soviet relations. Each article should explain what happened, who was involved, and why the event matters. Older students can include editorials written from different historical perspectives, clearly labeling them as opinion rather than fact.

Learning Outcome: Students demonstrate their understanding of the entire 1969–1980 period by explaining how détente emerged, changed Cold War diplomacy, encountered growing problems, and eventually gave way to renewed confrontation.