Which tribes were Plains Indians?

The term "Plains peoples" refers to a variety of distinct Indigenous groups, including the Siksika, Cree, Ojibwe, Assiniboine (Nakota), and Dakota.

Credit:

Arapaho, Assiniboine, Blackfoot, Cheyenne, Comanche, Crow, Gros Ventre, Kiowa, Lakota, Lipan, Plains Apache (or Kiowa Apache), Plains Cree, Plains Ojibwe, Sarsi, Nakoda (Stoney), and Tonkawa.

nothing certain is known about what happened, but it seems that the country declined gradually, perhaps due to bad government, or, more likely, due to a series of bad harvests, which resulted in widespread and recurrent famine.