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This article traces the historical development of the Cold War, the period of geopolitical tension between the United States and the Soviet Union and their respective allies from roughly 1947 to 1991. For background on the ideological frameworks involved, see the main Cold War page. Related histories include World War II History, Nuclear Weapons History, and Decolonization History.

The Cold War emerged from the wreckage of World War II. The wartime alliance between the United States, the United Kingdom, and the Soviet Union had always rested on the shared necessity of defeating Nazi Germany rather than on common political values. By the time of the Yalta Conference in February 1945, disagreements over the postwar order in Eastern Europe were already visible. President Franklin Roosevelt, Prime Minister Winston Churchill, and General Secretary Joseph Stalin negotiated the disposition of liberated territories, producing agreements on Poland and free elections that the Soviet Union subsequently interpreted and implemented in ways Western governments disputed.

Germany's surrender in May 1945 removed the alliance's organizing purpose. The Potsdam Conference in July-August 1945, attended by Stalin, the new American president Harry Truman, and Churchill (then replaced by Clement Attlee), produced further friction over German reparations, Polish borders, and Soviet behavior in occupied Eastern Europe. The United States tested its first atomic bomb during the conference; Truman informed Stalin obliquely, and Soviet intelligence had already provided partial information about the Manhattan Project.

The end of the Pacific war in August 1945 - following the atomic bombings of Hiroshima and Nagasaki - left the United States in an unprecedented position of global power, with a monopoly on nuclear weapons and an economy enlarged rather than destroyed by the war.

The term “Cold War” was popularized by journalist Walter Lippmann in 1947, though the phrase had earlier uses. By that point, the outlines of a divided Europe were already apparent. Soviet-backed governments had been installed or were consolidating in Poland, Romania, Bulgaria, and Hungary. A civil war in Greece pitted communist insurgents against the British-backed government.

In February 1946, Stalin delivered a speech in Moscow describing capitalism and communism as incompatible and conflict between them as inevitable. The following month, Churchill, speaking at Westminster College in Fulton, Missouri, declared that an “iron curtain” had descended across Europe. American diplomat George Kennan, writing under the pseudonym “X” in the journal Foreign Affairs in 1947, articulated a policy of “containment” - the proposition that Soviet expansionism should be resisted at its periphery rather than directly confronted.

The Truman Doctrine, announced to Congress in March 1947, committed the United States to supporting “free peoples who are resisting attempted subjugation by armed minorities or by outside pressures,” using Greece and Turkey as the immediate occasion. The Marshall Plan, announced in June 1947, offered American economic assistance to European nations for reconstruction; the Soviet Union rejected the plan and pressured Eastern European states to do the same.

The Cominform, an organization coordinating communist parties under Soviet direction, was established in September 1947. In February 1948, a communist coup in Czechoslovakia - a country with a functioning parliamentary tradition - consolidated Soviet control there. In June 1948, the Soviet Union blockaded Western-controlled sectors of Berlin; the United States and its allies responded with an airlift that continued until May 1949.

The North Atlantic Treaty Organization (NATO) was established in April 1949. In August 1949, the Soviet Union tested its first atomic bomb, ending the American nuclear monopoly. In October 1949, communist forces under Mao Zedong proclaimed the People's Republic of China, displacing the Nationalist government to Taiwan.

In June 1950, North Korean forces crossed the 38th parallel into South Korea. The United Nations Security Council, with the Soviet Union absent in a diplomatic protest, authorized a response. American and allied forces under General Douglas MacArthur intervened, initially retreating and then counterattacking. MacArthur's advance toward the Chinese border brought the People's Republic of China into the conflict in October 1950 with large-scale ground forces. The front stabilized near the original boundary.

MacArthur publicly disagreed with Truman's strategy of limiting the war to the Korean peninsula. Truman relieved MacArthur of command in April 1951. Armistice negotiations began in July 1951 and continued, with fighting ongoing, until July 1953, producing a ceasefire roughly along the prewar boundary.

American military spending increased substantially during and after the Korean War. NSC-68, a National Security Council document from April 1950, had recommended a major expansion of American defense spending; the war provided the political occasion to implement it. American military presence in Europe, Japan, and South Korea became permanent features of postwar geopolitics.

Concerns about communist infiltration of American institutions preceded Senator Joseph McCarthy. The House Un-American Activities Committee (HUAC) had been active since 1938. The Federal Bureau of Investigation under J. Edgar Hoover compiled extensive files on suspected communists and sympathizers. The Truman administration established a federal employee loyalty program in 1947.

The conviction of Alger Hiss in 1950 for perjury related to espionage allegations, and the arrest of Julius and Ethel Rosenberg in 1950 on charges of passing atomic secrets to the Soviet Union (they were executed in 1953), heightened public concern. McCarthy, a Wisconsin Republican senator, claimed in February 1950 to possess a list of communists employed in the State Department. His subsequent investigations, conducted through the Senate Permanent Subcommittee on Investigations after 1952, targeted individuals across government, the military, and cultural institutions.

McCarthy's influence declined following televised hearings in 1954 regarding alleged communist infiltration of the Army. Attorney Joseph Welch's pointed rebuke - “Have you no sense of decency?” - became a landmark of the period. The Senate censured McCarthy in December 1954. He died in 1957.

Stalin died in March 1953. A collective leadership initially governed the Soviet Union before Nikita Khrushchev consolidated power. In February 1956, Khrushchev delivered a “Secret Speech” to the 20th Congress of the Communist Party, denouncing Stalin's cult of personality and political terror. The speech was not officially published in the Soviet Union but circulated widely and was obtained by Western intelligence.

The thaw created expectations of liberalization within the Soviet bloc. Workers' uprisings occurred in East Germany in 1953 and in Poland in 1956. In Hungary in October 1956, a broader revolution brought Imre Nagy to power; Nagy announced Hungary's withdrawal from the Warsaw Pact. Soviet forces intervened in November 1956, crushing the uprising. Nagy was arrested and later executed. Western governments protested but did not intervene militarily.

The simultaneous Suez Crisis - in which Britain, France, and Israel attacked Egypt after President Gamal Abdel Nasser nationalized the Suez Canal - occupied Western attention and complicated any unified response to the Hungarian intervention. The United States pressured its allies to withdraw.

The Soviet Union launched Sputnik, the first artificial Earth satellite, in October 1957. The following month, Sputnik 2 carried a dog named Laika into orbit. The launches demonstrated Soviet ballistic missile capability and produced significant anxiety in the United States about the relative technological standings of the two powers.

American satellite and rocket programs accelerated. NASA was established in 1958. A series of launch failures gave early advantage to the Soviet space program. The Soviet Union sent Yuri Gagarin into orbit in April 1961 - the first human in space. President Kennedy, in a speech to Congress in May 1961, committed the United States to landing a man on the moon before the end of the decade. NASA's Apollo program achieved this in July 1969 with the Apollo 11 mission.

Khrushchev issued ultimatums over Berlin's status beginning in 1958, threatening to sign a separate peace treaty with East Germany that would have ended Western occupation rights. The crises produced repeated diplomatic confrontations without resolution.

The most visible consequence was the construction of the Berlin Wall, beginning in August 1961. East Germany, facing a continuing hemorrhage of its population through Berlin to the West, sealed the border. The Wall divided the city physically and became the most visible symbol of the Iron Curtain. Kennedy visited West Berlin in June 1963, delivering his “Ich bin ein Berliner” speech to a large crowd.

Fidel Castro's revolutionary forces overthrew the Batista government in Cuba in January 1959. Castro's government moved toward alignment with the Soviet Union and expropriated American-owned properties. The Eisenhower administration broke diplomatic relations with Cuba in January 1961 and had authorized the CIA to train Cuban exiles for an invasion.

The Kennedy administration proceeded with the plan. The Bay of Pigs invasion in April 1961 failed; among the factors cited by historians are the absence of the anticipated popular uprising, the withholding of American air support, and the capture of the exile force.¹⁾ The failure damaged American prestige and strengthened Castro's position.

In October 1962, American U-2 reconnaissance aircraft photographed Soviet ballistic missile installations under construction in Cuba. Kennedy was informed on October 16. After deliberation, he announced the discovery publicly on October 22 and declared a naval “quarantine” of Cuba, demanding the removal of the missiles. Soviet ships carrying additional materiel turned back. After negotiations involving the United States' pledge not to invade Cuba and a private assurance to remove American missiles from Turkey, the Soviet Union agreed to dismantle and remove the Cuban installations. Historians broadly regard the crisis as the closest the Cold War came to direct nuclear exchange.

Vietnam had been divided at the 17th parallel following the French defeat at Dien Bien Phu in 1954. The Geneva Accords called for reunification elections; these were never held. The United States supported the government of South Vietnam, which faced an insurgency backed by North Vietnam and the Soviet Union and China.

American involvement escalated incrementally. Military advisors under Eisenhower numbered in the hundreds; under Kennedy, several thousand; under Johnson, into the hundreds of thousands following the Gulf of Tonkin Resolution in August 1964, which Congress passed after reported North Vietnamese attacks on American naval vessels. The resolution authorized the president to use military force without a formal declaration of war.

Peak American troop strength reached approximately 543,000 in 1969. The Tet Offensive in January-February 1968 - a large-scale coordinated attack by North Vietnamese and Viet Cong forces throughout South Vietnam - was militarily repulsed but had substantial effects on American public opinion and political leadership. Lyndon Johnson announced he would not seek reelection.

The Nixon administration pursued “Vietnamization” - transferring combat responsibility to South Vietnamese forces - while expanding bombing campaigns and briefly invading Cambodia. American ground combat involvement ended with the Paris Peace Accords in January 1973. North Vietnamese forces took Saigon in April 1975.

The Nixon administration pursued a policy of détente with both the Soviet Union and the People's Republic of China. Nixon's visit to China in February 1972 - a country the United States had not formally recognized since 1949 - was a diplomatic landmark. The Strategic Arms Limitation Talks (SALT I) produced a treaty signed in May 1972 limiting certain categories of nuclear weapons. The Helsinki Accords of 1975 produced agreement on European borders and included human rights provisions.

The Soviet Union under Leonid Brezhnev expanded its military capabilities and extended Soviet influence into Africa and elsewhere during this period. The Brezhnev Doctrine, articulated following the 1968 Warsaw Pact invasion of Czechoslovakia to suppress the “Prague Spring” reforms, asserted the Soviet Union's right to intervene in socialist states to preserve socialist governments.

Détente effectively ended with the Soviet invasion of Afghanistan in December 1979. The Carter administration responded with a grain embargo, a boycott of the 1980 Moscow Olympics, and support for Afghan resistance forces (the mujahideen). Carter also withdrew the SALT II treaty from Senate consideration.

The Reagan administration, taking office in January 1981, adopted a more confrontational posture. Reagan described the Soviet Union as an “evil empire” in a 1983 speech and announced the Strategic Defense Initiative (SDI) - a proposed missile defense system. American defense spending increased substantially. The administration supported anti-communist insurgencies in Afghanistan, Nicaragua, Angola, and elsewhere - a policy that became known as the Reagan Doctrine.

Soviet-American relations reached a low point in 1983. The Soviet Union shot down Korean Air Lines Flight 007 in September 1983, killing all 269 aboard, after the aircraft strayed into Soviet airspace. NATO's deployment of Pershing II missiles in Western Europe in November 1983 prompted the Soviet Union to walk out of arms control talks. The Soviet leadership, under a succession of elderly and ailing general secretaries following Brezhnev's death in 1982, interpreted NATO exercises in November 1983 (Operation Able Archer) as potentially covering a real attack and raised its nuclear forces to heightened alert.

Mikhail Gorbachev became General Secretary of the Soviet Communist Party in March 1985. He introduced two signature reform programs: glasnost (openness - relaxation of censorship and political controls) and perestroika (restructuring - economic and administrative reform). Gorbachev also sought improved relations with the West, meeting Reagan at summits in Geneva (1985), Reykjavik (1986), Washington (1987), and Moscow (1988).

The Intermediate-Range Nuclear Forces (INF) Treaty, signed in December 1987, eliminated an entire category of nuclear weapons and included unprecedented verification provisions. Soviet forces began withdrawing from Afghanistan in 1988, completing the withdrawal in February 1989.

In 1989, political change accelerated throughout Eastern Europe. Free elections in Poland produced a Solidarity-led government in June. Hungary opened its border with Austria in May, and thousands of East Germans fled westward. Mass protests in East Germany led to the opening of the Berlin Wall on November 9, 1989. Communist governments fell in rapid succession in Bulgaria, Czechoslovakia (in the “Velvet Revolution”), and Romania (where Nicolae Ceaușescu was executed). Gorbachev did not invoke the Brezhnev Doctrine to halt these changes.

German reunification occurred in October 1990. The Warsaw Pact dissolved in July 1991. In August 1991, communist hardliners mounted a coup against Gorbachev; it failed within three days, but the episode accelerated the dissolution of Soviet institutions. The Soviet Union formally dissolved on December 25, 1991, when Gorbachev resigned and transferred nuclear control to Boris Yeltsin of the Russian Federation. Fifteen independent states emerged from the former Soviet Union.

Historians dispute whether the Cold War was primarily a product of Soviet expansionism or of American overreaction to legitimate Soviet security concerns; see Cold War Origins Debate.

The relative weight of American economic pressure, military competition, internal Soviet dysfunction, and Gorbachev's personal decisions in causing the Soviet collapse remains contested among historians; see Soviet Collapse Debate.

Whether détente strengthened or weakened the Western position relative to the Soviet Union is disputed, particularly regarding the degree to which it provided the Soviet Union economic and technological resources; see Détente Debate.

The degree to which Reagan administration policies specifically - as distinct from longer structural factors - accelerated the Soviet collapse is a matter of ongoing historical argument; see Reagan and the Cold War Debate.

Some historians argue that Western intelligence agencies systematically overestimated Soviet military and economic strength throughout the Cold War; see Cold War Intelligence Consensus.

The moral and strategic justification for American support of authoritarian anti-communist governments and insurgencies is disputed; see Cold War Proxy Wars Debate.

1. Kennan, George F. (“X”). “The Sources of Soviet Conduct.” Foreign Affairs 25, no. 4 (July 1947): 566-582. 2. Lippmann, Walter. The Cold War: A Study in U.S. Foreign Policy. New York: Harper & Brothers, 1947. 3. Gaddis, John Lewis. The Cold War: A New History. New York: Penguin Press, 2005. 4. Gaddis, John Lewis. We Now Know: Rethinking Cold War History. Oxford: Clarendon Press, 1997. 5. Zubok, Vladislav, and Constantine Pleshakov. Inside the Kremlin's Cold War: From Stalin to Khrushchev. Cambridge: Harvard University Press, 1996. 6. Westad, Odd Arne. The Cold War: A World History. New York: Basic Books, 2017. 7. Beschloss, Michael R. The Crisis Years: Kennedy and Khrushchev, 1960-1963. New York: Edward Burlingame Books, 1991. 8. Herring, George C. America's Longest War: The United States and Vietnam, 1950-1975. 4th ed. New York: McGraw-Hill, 2001. 9. Dobbs, Michael. One Minute to Midnight: Kennedy, Khrushchev, and Castro on the Brink of Nuclear War. New York: Knopf, 2008. 10. Matlock, Jack F. Reagan and Gorbachev: How the Cold War Ended. New York: Random House, 2004. 11. Andrew, Christopher, and Oleg Gordievsky. KGB: The Inside Story. New York: HarperCollins, 1990. 12. Oberdorfer, Don. From the Cold War to a New Era: The United States and the Soviet Union, 1983-1991. Updated ed. Baltimore: Johns Hopkins University Press, 1998.