Published September 19, 2012
It was 150 years ago that Union and Confederate troops squared off at Antietam Creek, Maryland, - a major Civil War victory for the Union that some historians say changed the course of American history. That's because five days later President Abraham Lincoln issued the Preliminary Emancipation Proclamation, which eventually brought an end to slavery in the United States. Mariama Diallo reports from the Washington memorial that bears the 16th president’s name, where hundreds gathered to reflect the nation's past.