The Cold War (1947–1991): Nuclear Stand-Off, Proxy Wars & Iron Curtain

Origins & Timeline: When Did the Cold War Start and Why?

The wartime alliance between the United States and the Soviet Union was an expedient marriage of convenience united solely by the shared necessity of destroying Nazi Germany in World War II. As soon as the common enemy collapsed in May 1945, fundamental ideological antagonisms re-emerged. At the Yalta and Potsdam conferences, Joseph Stalin refused to permit democratic elections in the Eastern European territories liberated by the Red Army, transforming Poland, Hungary, Romania, Bulgaria, and East Germany into Soviet satellite states.

In March 1946, former British Prime Minister Winston Churchill delivered his historic address in Fulton, Missouri, warning that "an iron curtain has descended across the Continent." In Washington, diplomat George F. Kennan authored the influential "Long Telegram," arguing that Soviet power was fundamentally expansionist and insecure. This memorandum became the intellectual foundation of the American policy of containment, codified in the Truman Doctrine (1947) and the Marshall Plan, which poured over $13 billion into rebuilding Western European democratic economies to insulate them from communist influence.

Cold War Timeline: Key Proxy Wars & Nuclear Crises (1948–1989)

Because direct military conflict between the superpowers guaranteed nuclear Armageddon, the Cold War was fought through covert intelligence operations, regional proxy wars, and high-stakes brinkmanship:

How the Cold War Ended: Glasnost, Perestroika & Collapse

By the 1980s, the Soviet economic command model was collapsing under the strain of astronomical military expenditures (consuming over 20% of GDP), endemic corruption, and technological backwardness. When Mikhail Gorbachev became General Secretary in 1985, he recognized that the USSR could no longer compete with Western innovation—including the development of ARPANET and computer networking and Ronald Reagan's Strategic Defense Initiative.

Gorbachev introduced twin reform policies: Glasnost (political openness and free press) and Perestroika (economic restructuring). Crucially, Gorbachev abandoned the "Brezhnev Doctrine," signaling that the Red Army would not intervene to crush pro-democracy uprisings in Eastern Europe. In autumn 1989, peaceful revolutions swept across Poland, Hungary, Czechoslovakia, and Romania. On November 9, 1989, the Berlin Wall was breached. Two years later, following a failed hardline communist coup, the Soviet flag was lowered over the Kremlin on December 25, 1991, dissolving the USSR into fifteen independent sovereign republics and concluding the Cold War.