1900-1950 By jleader Period: 1914 to 1918 World War 1 1917 Russian Revolution 1918 Dismantle of Austria-Hungary 1919 Treaty of Versailles 1920 League of Nations Formed 1920 Nazi Party Formed 1922 Dismantle of Ottoman Empire Period: 1929 to 1933 Great Depression 1931 Japanese invasion of Manchuria 1933 Hitlers Rise to Power Period: 1936 to 1938 Great Purge (Russia) Period: 1939 to 1945 World War 2 1941 Pearl Habor 1941 Japanese expansion into Pacific Islands Period: 1941 to 1945 Holocaust 1945 United Nations Formed 1945 Atomic Bombs: Hiroshima and Nagasaki Period: 1947 to 1949 Independence of India, Pakistan, Israel, Indonesia Period: 1947 to 1991 Cold War 1949 Communist Triumph in Chinese Revolution