Wall Street Crash and the Great Depression
A stock crash triggers the century's worst slump

In October 1929 share prices collapsed on the New York Stock Exchange. The crash ushered in the Great Depression, the worst economic crisis of the 20th century, bringing mass unemployment worldwide and feeding the rise of radical movements.
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Meanwhile around the world (±25 years)
Whole world
- 1914–1918 World War I — 15 years earlier
- 1918–1920 Spanish flu pandemic — 11 years earlier
- 1939–1945 World War II — 10 years later
- 1947–1991 Cold War — 18 years later
- 1948 Universal Declaration of Human Rights — 19 years later
Europe
- 1919 Treaty of Versailles — 10 years earlier
- 1928 Discovery of penicillin — 1 year earlier
- 1933 Hitler comes to power — 4 years later
- 1936–1939 Spanish Civil War — 7 years later
- 1941–1945 The Holocaust — 12 years later
Eastern Europe & Russia
- 1917 October Revolution — 12 years earlier
- 1917–1922 Russian Civil War — 12 years earlier
- 1929–1933 Collectivization in the Soviet Union — same year
- 1936–1938 Great Purge — 7 years later
- 1941–1944 Siege of Leningrad — 12 years later
Middle East
- 1908 Oil struck at Masjed Soleyman — 21 years earlier
- 1915 Armenian genocide — 14 years earlier
- 1916 Sykes–Picot Agreement — 13 years earlier
- 1916–1918 The Arab Revolt — 13 years earlier
- 1932 Kingdom of Saudi Arabia proclaimed — 3 years later
Africa
- 1904–1908 The Herero and Nama genocide — 25 years earlier
- 1922 Discovery of Tutankhamun's tomb — 7 years earlier
- 1935–1937 Italy invades Ethiopia — 6 years later
Asia
- 1923 Great Kantō earthquake — 6 years earlier
- 1931 China floods — 2 years later
- 1934–1935 Long March — 5 years later
- 1945 Atomic bombing of Hiroshima — 16 years later
- 1953 First ascent of Everest — 24 years later
Oceania
- 1911 Amundsen reaches the South Pole — 18 years earlier
- 1912 The death of Scott's polar party — 17 years earlier
- 1936 Death of the last thylacine — 7 years later
- 1941 Attack on Pearl Harbor — 12 years later
- 1942 The Battle of Midway — 13 years later
Alive at the time
- Thomas Edison (aged 82)
- Nikola Tesla (aged 73)
- Marie Curie (aged 62)
- Mahatma Gandhi (aged 60)
- Ernest Rutherford (aged 58)
- Winston Churchill (aged 55)
- Joseph Stalin (aged 51)
- Albert Einstein (aged 50)
- Pablo Picasso (aged 48)
- Mustafa Kemal Atatürk (aged 48)