On this day: September 17

POSTED: 11:49 AM PDT Sep 14, 2012    UPDATED: 11:00 PM PDT Sep 16, 2013 
Civil War, Battle of Antietam painting

The U.S. Constitution is signed, the Civil War sees the bloodiest battle in American history, the prototype space shuttle Enterprise is unveiled, and the Camp David Accords bring peace between Egypt and Israel, all on this day.