World War II By Sydneydaviss Sep 1, 1939 Germany Invades Poland, initiating World War II in Europe. Sep 27, 1939 Warsaw surrenders, Polish government flee to exile Jun 10, 1940 Italy enters the war Mar 1, 1941 Bulgaria joins the Axis powers Dec 7, 1941 Japan bombs the Pearl Harbor May 9, 1945 Germany surrenders to the soviets Aug 6, 1945 The United States drops an atomic bomb on Hiroshima Aug 9, 1945 The US drops an atomic bomb on Nagasaki, Sep 2, 1945 Japan surrender, ending world war II