Timeline of Basic United States History Dates By imacoolcat Aug 20, 1492 Columbus sails the ocean blue Period: Aug 20, 1492 to Aug 20, 2003 1492-2003 Aug 20, 1607 Jamestown Jul 4, 1776 Decleration of Independence Aug 20, 1789 Constitution Aug 20, 1803 Louisiana Purchase Aug 20, 1812 War of 1812 Period: Aug 20, 1861 to Aug 20, 1865 Civil War Period: Aug 20, 1917 to Aug 20, 1918 Us Involvement in WWI Aug 20, 1929 Stock Market Crash and beginning of Great Depression Period: Aug 20, 1941 to Aug 20, 1945 U.S involvement in WWI Period: Aug 20, 1941 to Aug 20, 1945 U.S involvement in WWII Period: Aug 20, 1945 to Aug 20, 1989 Cold War Period: Aug 20, 1950 to Aug 20, 1953 Korean War Period: Aug 20, 1965 to Aug 20, 1973 Vietnam War Aug 20, 1991 Gulf War Aug 20, 2003 US invasion of Iraq Sep 11, 2010 September 11