20th century By journeyw Jul 28, 1914 World War 1 Jun 28, 1919 Treaty of Versailles Aug 18, 1920 Ratification of 19th Amendment Jul 18, 1921 Russian Civil War Jan 21, 1924 Lenin dies Oct 29, 1929 Black Tuesday Nov 11, 1929 Stalin becomes leader Jan 30, 1933 Hitler becomes Chancellor Sep 1, 1939 World War II Begins Dec 5, 1941 Winter Campaign Dec 7, 1941 Pearl Harbor Apr 11, 1945 Cold War Begins Aug 6, 1945 First Atomic Bomb Dropper on Japan Sep 2, 1945 World War II Ends Oct 14, 1962 Cuban Missile Crisis Nov 9, 1989 Collapse of Berlin Wall Apr 11, 1991 Cold War Ends