 To fill the void left by the demise of the Susquehannocks, the Iroquois also encouraged displaced tribes from the east to settle in the West Branch watershed, including the Lenape (or Delaware) and Shawnee.The Seneca allowed very few travelers to pass through the area and kept non-native settlement to a minimum.The French and Indian War (1754–1763) led to the migration of many Native Americans westward to the Ohio River basin, and more departed after the American Revolutionary War (1775–1783).