The French and Indian War (1754–63) led to the migration of many Native Americans westward to the Ohio River basin. On November 5, 1768, the British acquired the New Purchase from the Iroquois in the Treaty of Fort Stanwix, including what is now the Pine Creek Gorge east of the creek. The Purchase line established by this treaty was disputed, as it was unclear whether the border along "Tiadaghton Creek" referred to Pine Creek or to Lycoming Creek, further to the east. As a result, the land between them was disputed territory until 1784 and the Second Treaty of Fort Stanwix. After the American Revolutionary War, Native Americans almost entirely left Pennsylvania; some isolated bands of natives remained in Pine Creek Gorge until the War of 1812.