World War II Timeline By joshtittelfitz Period: Jan 1, 1939 to Sep 2, 1945 World War II: Before, During, and After Aug 23, 1939 Nazi Germany and the Soviet Union sign a formal nonaggression pact. Jun 10, 1940 Italy officially enters World War II on the side of the Axis powers. Jun 22, 1941 Nazi Germany breaks the nonaggresion pact with Stalin by invading the Soviet Union. Dec 8, 1941 The United States officially enters World War II after the Japanese attacked Pearl Harbor. Jun 6, 1944 British and American troops invade the beaches of Normandy, opening a new front against the Axis powers. Apr 30, 1945 Hitler commits suicide in a bunker in Berlin. Sep 2, 1945 Japan formally surrenders, ending World War II.
