What American civilization was largely nomadic?

The Plains Indians, including tribes such as the Sioux, Cheyenne, and Comanche, were largely nomadic American civilizations. They followed the buffalo herds across the Great Plains, relying on them for food, clothing, and shelter. Their nomadic lifestyle was closely tied to the seasons and the migratory patterns of the buffalo, which shaped their social structures and cultural practices. This way of life was significantly impacted by the arrival of European settlers and changes in the environment.