The Constitution was completed and signed by a majority of the delegates attending the constitutional convention in Philadelphia.
The bloodiest day in U.S. military history occurred at the Battle of Antietam when more than 23,000 were killed or wounded.
Lt. Thomas Selfridge, a passenger in a plane piloted by Orville Wright, became the first airplane fatality when the craft crashed.
The American Professional Football Association—a precursor of the NFL—was formed in Canton, Ohio.
Anastasio Somoza Debayle, former president of Nicaragua, was assassinated in Paraguay.
Heather Whitestone of Alabama became the first deaf Miss America.
Barry Bonds became the third baseball player to hit 700 career home runs, joining Hank Aaron and Babe Ruth.