1776 ― Formal signing of the Declaration of Independence
1819 ― First parachute jump in U.S.
1832 ― White settlers massacre fleeing Indians ending Battle of Bad Axe River, Wisc.
1858 ― First street mailboxes introduced in Boston, Mass.
1875 ― First roller skating rink opens in London
1877 ― SF Public Library opens with 5,000 volumes
1909 ― Army Air Corps formed as Army takes first delivery from Wright Brothers
1964 ― North Vietnam fires on USS Maddox in Gulf of Tonkin
1980 ― U.S. swimmers set three world records at national championships
1989 ― NASA confirmed Voyager 2's discovery of three more moons of Neptune
1990 ― Iraq invades, occupies Kuwait