Before the US Army Corps of Engineers built the locks and dams, before Lewis and Clark, before people from western Europe and Africa stepped onto the continent of North America, the first peoples to live along the Ohio River established an intricate system of villages and ceremonial places. The Ohio River brought them to these lands. The Ohio River was the conduit for their extensive trade network with other peoples to the north, the east, the west, and the south. They had their own system. We can still see the marks of the First Peoples System at many locations along the Ohio River.