20th Century Important Events By facebooker_10219977892691994 1914 World War I 1917 The Russian Revolution and Communism 1918 The end of the First World War From 1918 to 1921, Russia suffered a terrible civil war. 1919 Treaty of Versailles 1920 Boom time in America 1923 Hitler was arrested. 1924 Lenin died. 1928 The Five years Plans were implemented by Stalin 1929 The Wall Street Crash 1930 The Nazis Party won the elections 1935 Hitler was preparing the war 1936 Olympic Games were held in Berlin 1939 The Second World War The "Final Solution" started 1945 The Second World War finished Six million Jews were killed 1947 The Cold War started 1949 Gandhi died