World War 2 timeline By clay1 Apr 6, 1917 - U.S. joins the war Sep 1, 1939 Start of the war in Atlantic/European Theater Sep 1, 1939 - Start of the war in Atlantic/European Theater Mar 11, 1941 - Lend/Lease Act Dec 7, 1941 Start of the war in Pacific Theater Dec 7, 1941 - Start of the war in Pacific Theaters Dec 7, 1941 - Pearl Harbor Feb 4, 1945 - Yalta Conference Apr 12, 1945 - Death of Roosevelt May 8, 1945 - V-E day Aug 6, 1945 - Hiroshima Aug 6, 1945 - Nagasaki Aug 15, 1945 - V-J day Oct 24, 1945 - Creation of United Nations Jun 6, 1966 - D-day
