The Constitutional Convention formally adopts and signs the United States Constitution in Philadelphia. Delaware would become the first state to ratify the Constitution on December 7, 1787.
Battle of Antietam
Union and Confederate forces clash at the Battle of Antietam in Sharpsburg, Maryland, making it the single bloodiest day in American history. Considered a draw, the Confederates retreated back to Virginia after the battle, ending the Maryland Campaign.
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