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.
Preceding Causes
Failures of the Treaty of Versailles settlement, the Great Depression destabilizing democracies, rise of fascism in Germany and Italy, the policy of appeasement (Munich Agreement 1938), Japanese imperial expansion in East Asia (invasion of Manchuria 1931, China 1937), and German aggression beginning with the invasion of Poland on September 1, 1939.
Historical Consequences
Formation of the United Nations, the Cold War bipolar world order, wave of decolonization across Asia and Africa, establishment of the State of Israel, the nuclear age and deterrence doctrine, the Nuremberg Trials establishing the principle that individuals bear responsibility for war crimes, and the European integration project that eventually became the EU.
Decolonization of Africa
The wave of African independence movements following WWII that transformed 50+ colonies into independent nations between 1945–1994.
Vietnamese Independence
Vietnam's three-decade struggle for independence and reunification: first defeating France at Dien Bien Phu (1954), then fighting the US-backed South Vietnam in a devastating war ending with North Vietnamese victory and reunification in 1975.
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).
NATO Treaty
The North Atlantic Treaty established a military alliance of Western democracies committed to collective defense against Soviet expansion, creating NATO.
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.
Partition of India
The division of British India into India and Pakistan (West Pakistan and East Bengal) along broadly religious lines, causing one of history's largest mass migrations (10-20 million displaced) and an estimated 1-2 million deaths in communal violence.
Partition of Korea
Korea was divided at the 38th parallel after WWII between Soviet-occupied north and US-occupied south, eventually hardening into two separate states still divided today.
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.
UN Charter
The founding document of the United Nations, signed by 50 nations in San Francisco after WWII to maintain international peace, develop friendly relations among nations, and promote human rights.
Chinese Communist Revolution
Mao Zedong's Chinese Communist Party defeated Chiang Kai-shek's Nationalist government in the Chinese Civil War, proclaiming the People's Republic of China on October 1, 1949.