The 1780s decade ran from January 1, 1780, to December 31, 1789.

Millennium: 2nd millennium
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March 13, 1781: Uranus is discovered.
The first manned hot-air balloon, designed by the Montgolfier brothers, takes off from the Bois de Boulogne, on November 21, 1783
September 17, 1787: The United States Constitution is signed in Philadelphia.

Events

1780

January–March