The Plains Tribesmen were a group of Native American tribes that lived on the Great Plains of North America. The Omaha, Otos, Pawnees, and Crow Indians were all part of this group. The Omaha were a Siouan-speaking tribe that lived in present-day Nebraska and Iowa. The Otos were a Siouan-speaking tribe that lived in present-day Nebraska and Kansas. The Pawnees were a Caddoan-speaking tribe that lived in present-day Nebraska and Kansas. The Crow Indians were an Algonquian-speaking tribe that lived in present-day Montana and Wyoming.