 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 . 
