1787

The year 1787 started on Monday, January 1, and ended on Monday, December 31. On Monday, September 17, the United States Constitution was signed.

U.S. states admitted
In 1787, three U.S. states were admitted to the Union:
 * Delaware (the first state) on Friday, December 7
 * Pennsylvania (the second state) on Wednesday, December 12
 * New Jersey (the third state) on Tuesday, December 18