us war history By carter8192 Jul 4, 1776 Declaration Of independence is signed Period: Apr 12, 1861 to May 26, 1865 The American Civil war Period: Apr 6, 1917 to Nov 11, 1918 America in ww1 Dec 8, 1939 America declares war on japan Dec 7, 1941 America is attacked by Japan / Pearl harbor Dec 11, 1941 America declares war on Germany/Nazis May 9, 1945 Ww2 is declared over on all fronts Period: Jun 25, 1950 to Jul 27, 1953 Korean war Period: Apr 1, 1965 to Mar 29, 1973 Vietnam war Period: Sep 11, 2001 to Aug 30, 2021 War in The middle east longest war and fighting in the middle started due to a terroist attack on the world trade center