World War II Timeline By keubanks1 Jul 14, 1933 Nazi Party Declared the Only Political Party Mar 16, 1935 Hitler Violates the Treaty Of Versailles Mar 15, 1939 Nazis Take Czechoslovakia (March 15-16) Sep 1, 1939 Germany Invades Poland This is the official start to the war Sep 3, 1939 Britain and France Declare War on Germany Dec 7, 1941 Japan Bombs Pear Harbor Dec 8, 1941 United States Declares War on Japan (entering WWII) Dec 11, 1941 Nazi Germany and Axis Partners Declare War on The United States Aug 1, 1942 US troops halt the Japanese island-hopping August-November Apr 30, 1945 Hitler Commits Suicide May 7, 1945 Germany Surrenders (May 7-9th) Aug 6, 1945 The United States Drops an Atomic Bomb on Hiroshima Aug 8, 1945 The Soviet Union Declares War on Japan Aug 9, 1945 The United States Drops an Atomic Bomb on Nagasaki Oct 24, 1945 The United Nations is Born
