World War II By abumpers626 Sep 1, 1939 Germany invades Poland Sep 3, 1939 Britain, Australia, New Zealand, and France declare war on Germany Sep 5, 1939 US proclaims its neutrality Dec 7, 1941 Japan makes surprise attack at Pearl Harbor Dec 8, 1941 US declares war on Axis powers Jan 26, 1942 First American forces arrive in Great Britain Apr 12, 1944 President Roosevelt dies and Harry Truman becomes President Jul 24, 1944 US landings on Guam Apr 1, 1945 US troops encircle Germans in Ruhr Aug 6, 1945 US drops atomic bomb on Hiroshima Aug 9, 1945 US drops atomic bomb on Nagasaki in Japan Aug 14, 1945 Japanese surrender Sep 2, 1945 WWII ends
