World War II Timeline By cassie_luna3 Sep 3, 1939 Start of the war in Atlantic/European Theater Mar 11, 1941 Lend/Lease Act Dec 7, 1941 Pearl Harbor Dec 7, 1941 Start of the war in Pacific Theater Dec 8, 1941 U.S. joins the war Jun 6, 1944 D-day Feb 4, 1945 Yalta Conference Apr 12, 1945 Death of Roosevelt May 8, 1945 V-E day Aug 6, 1945 Hiroshima Aug 9, 1945 Nagasaki Aug 15, 1945 V-J day Oct 24, 1945 Creation of the United Nations
