World War 2 By cdeere1 Apr 24, 1934 Mao Zedong heads Long March Period: Apr 24, 1934 to Dec 24, 1945 World War 2 Apr 24, 1939 Germany invades Poland; France and Great Britain declare war on Germany Apr 24, 1941 Japan attacks Pearl Harbor May 24, 1945 Germany Surrenders. (Hitler commits suicide) Sep 24, 1945 Allies use atomic bombs on Hiroshima and Nagasaki Dec 24, 1945 United Nations formed