The French and Indian War (1754–1763) led to the migration of many Native Americans westward to the Ohio River basin. In October 1784, the United States acquired a large tract of land, including what is now Upper Pine Bottom State Park, from the Iroquois in the Second Treaty of Fort Stanwix (this acquisition is known in Pennsylvania as the Last Purchase). In the years that followed, Native Americans almost entirely left Pennsylvania; however some isolated bands of natives remained in the Pine Creek Gorge until the War of 1812.