Cold War
A geopolitical and ideological rivalry between the United States and the Soviet Union that defined global politics for over four decades through nuclear deterrence, proxy wars, and competition for influence across the developing world.
Preceding Causes
Incompatible US and Soviet visions for the post-WWII order, ideological conflict between liberal capitalism and Marxism-Leninism, Soviet domination of Eastern Europe, the nuclear arms race triggered by the US atomic monopoly (1945-49), and the Truman Doctrine's commitment to containing communism.
World War II
The deadliest conflict in human history, killing an estimated 70–85 million people. The war included the Holocaust — the genocide of 6 million Jews and millions of others — and ended in the Pacific theater with the atomic bombings of Hiroshima and Nagasaki.
NATO Treaty
The North Atlantic Treaty established a military alliance of Western democracies committed to collective defense against Soviet expansion, creating NATO.
Russian Revolution
Two revolutions in 1917 — the February Revolution that overthrew Tsar Nicholas II and the October Revolution in which the Bolsheviks seized power — led to the Russian Civil War and the creation of the Soviet Union (1922).
Partition of Germany
Germany was divided into West Germany (democratic, NATO-aligned) and East Germany (communist, Soviet-aligned) after WWII, with the Berlin Wall built in 1961 to stop East Germans fleeing west.
Historical Consequences
Korean and Vietnam Wars, the Space Race and moon landing, nuclear deterrence doctrine (MAD), proxy conflicts across the developing world (Latin America, Africa, Middle East, Asia), the collapse of the Soviet Union in 1991, and the emergence of US-led unipolarity.
Korean War
North Korea invaded South Korea, drawing in US-led UN forces and China, ending in armistice that still governs the divided Korean peninsula.
Space Race
A Cold War competition between the US and USSR to achieve firsts in space exploration, from Sputnik (1957) through Gagarin's orbital flight (1961) to the Apollo 11 moon landing (July 20, 1969).
Dissolution of the Soviet Union
The Soviet Union formally dissolved on December 25, 1991, creating 15 independent states and ending the Cold War and communist superpower competition.
Iranian Revolution
Mass uprising overthrew Shah Pahlavi and established an Islamic Republic under Ayatollah Khomeini, transforming Iran into a theocracy.
Vietnam War
A Cold War proxy conflict between North Vietnam (communist, Soviet/Chinese-backed) and South Vietnam (US-backed) that killed over 3 million people.
Arab Spring
A wave of pro-democracy protests, uprisings, and revolutions across the Arab world, triggered by Mohamed Bouazizi's self-immolation in Tunisia on December 17, 2010.
Chinese Cultural Revolution
Mao Zedong launched the Cultural Revolution to reassert his authority and purge "capitalist roaders" and "counter-revolutionaries," mobilizing millions of Red Guards in a campaign of mass persecution that killed an estimated 500,000 to 2 million people and destroyed vast amounts of China's cultural heritage.
Cuban Revolution
Fidel Castro led a guerrilla campaign from the Sierra Maestra mountains that overthrew the US-backed Batista dictatorship on January 1, 1959, establishing a socialist state 90 miles from Florida.