The bloodiest day in United States history was September 17, 1862, when, during the Civil War battle at Antietam, close to 6,500 soldiers were killed or mortally wounded and another 15,000 were seriously wounded. Moreover, James M. McPherson states in his concise chronicle of the event Crossroads of Freedom, it may well have been the pivotal moment of the war and possibly of the young republic... (read more)