The Cold War: origins to détente

From Grand Alliance to Iron Curtain

The Cold War was the global ideological, geopolitical and military rivalry between the United States and the Soviet Union and their respective blocs, conventionally dated from 1947 to 1991. Its origins lay in the unresolved settlement of the Second World War. At the Yalta Conference (4-11 February 1945) Roosevelt, Churchill and Stalin agreed on free elections in liberated Europe under the Declaration on Liberated Europe; at Potsdam (17 July-2 August 1945) the breakdown over German reparations and Polish borders was already visible. George Kennan's Long Telegram (22 February 1946) and his 'X' article The Sources of Soviet Conduct (Foreign Affairs, July 1947) supplied the intellectual basis of containment. Churchill's 'Iron Curtain' speech at Fulton, Missouri (5 March 1946) named the dividing line.

The Doctrines of 1947-1949

The rupture crystallised in 1947. The Truman Doctrine (12 March 1947) pledged support to Greece and Turkey against communist pressure, committing the US to assist 'free peoples' resisting subjugation. The Marshall Plan (European Recovery Program, announced 5 June 1947, enacted April 1948) channelled roughly $13 billion to Western Europe; the USSR refused participation and barred its satellites. Moscow responded with the Cominform (September 1947) and the Molotov Plan, later institutionalised as Comecon (1949).

Germany became the first flashpoint. The Berlin Blockade (24 June 1948-12 May 1949) prompted the Western Berlin Airlift, which flew in some 2.3 million tons of supplies. The crisis hardened the division: the Federal Republic of Germany and the German Democratic Republic were both founded in 1949. Western security was anchored by the North Atlantic Treaty (4 April 1949), whose Article 5 enshrined collective defence; the Soviet riposte, the Warsaw Pact, followed on 14 May 1955 after West German NATO accession.

Two Shocks of 1949

Nineteen forty-nine delivered two transformative shocks. In August the USSR tested its first atomic bomb, ending the American nuclear monopoly four years after Hiroshima and Nagasaki. In October Mao Zedong proclaimed the People's Republic of China, and the Sino-Soviet Treaty of Friendship (14 February 1950) appeared to extend the communist bloc across Asia. Together these events transformed a European confrontation into a global contest, codified in the US planning document NSC-68 (April 1950), which called for a vast rearmament. Within months the Korean War (25 June 1950-27 July 1953 armistice) turned the Cold War hot, fixing the pattern of proxy conflict, divided states and limited war under the nuclear shadow that would define the next two decades.

Brinkmanship: Berlin, Cuba and the Nuclear Edge

The late 1950s and early 1960s were the era of maximum danger. The death of Stalin (March 1953) and Khrushchev's Secret Speech (25 February 1956) denouncing the cult of personality coincided with the crushing of the Hungarian Uprising (October-November 1956), demonstrating the limits of 'thaw' inside the bloc. The U-2 incident (1 May 1960) wrecked the Paris summit. The Berlin Wall (erected 13 August 1961) sealed the inner-German border. The confrontation peaked in the Cuban Missile Crisis (16-28 October 1962), the closest approach to nuclear war, resolved by Soviet withdrawal of missiles in exchange for a US non-invasion pledge and the quiet removal of Jupiter missiles from Turkey. Its lessons produced the Moscow-Washington hotline (1963) and the Partial Test Ban Treaty (5 August 1963).

The Logic of Détente

Détente — the relaxation of tensions — emerged from a strategic stalemate. By the late 1960s both superpowers possessed assured second-strike capability, making Mutually Assured Destruction (MAD) the governing logic. The Treaty on the Non-Proliferation of Nuclear Weapons (NPT, signed 1968, in force 1970) institutionalised the nuclear order. West German Chancellor Willy Brandt's Ostpolitik normalised relations with the East (Moscow and Warsaw Treaties 1970; Basic Treaty with the GDR 1972). Nixon and Kissinger's opening to China (Nixon's visit, February 1972) exploited the Sino-Soviet split (border clashes at the Ussuri River, March 1969) to triangulate diplomacy.

The Instruments of Thaw

Détente was codified in arms control. The Strategic Arms Limitation Talks produced SALT I (26 May 1972), comprising the Anti-Ballistic Missile (ABM) Treaty and an Interim Agreement capping launchers. The Helsinki Final Act (1 August 1975), signed by 35 states under the Conference on Security and Co-operation in Europe, accepted post-war borders ('Basket I') while committing signatories to human-rights principles ('Basket III') — a clause later wielded by dissidents such as Charter 77. Yet détente was fragile: SALT II (signed June 1979) was never ratified by the US Senate after the Soviet invasion of Afghanistan (December 1979), which, with the election of Ronald Reagan, ushered in the 'Second Cold War'. Détente never ended the rivalry; it managed it, substituting negotiated stability for brinkmanship while leaving the underlying ideological contest intact.