Basic Dates By biscuit66 Aug 20, 1492 Columbus Sails the Ocean Blue Aug 20, 1607 Jamestown Aug 20, 1776 Declaration of Independence Aug 20, 1789 Constitution Aug 20, 1803 Lousiana 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 U.S Involvement in World War 1 Aug 20, 1929 Stock Market Crash and beginning of Great Depression Period: Aug 20, 1941 to Aug 20, 1945 U.S Involvement in World War 2 Period: Aug 20, 1945 to Aug 20, 1989 Cold War Period: Aug 20, 1950 to Aug 20, 1953 Cold War Period: Aug 20, 1965 to Aug 20, 1973 Vietnam War Aug 20, 1991 Gulf War Sep 11, 2001 Spetember 11 Aug 20, 2003 US Invasion of Iraq