George Washington (February 22, 1732 – December 14, 1799) was an American political leader, military general, statesman, and founding father who served as the first president of the United States from 1789 to 1797. Previously, he led Patriot forces to victory in the nation's War for Independence. He presided at the Constitutional Convention of 1787, which established the U.S. Constitution. In October 1753, Dinwiddie appointed Washington as a special envoy to demand that the French vacate territory which the British had claimed. Dinwiddie also appointed him to make peace with the Iroquois Confederacy and to gather intelligence about the French forces. Washington met with Half-King Tanacharison and other Iroquois chiefs at Logstown to secure their promise of support against the French, and his party reached the Ohio River in November.