Question: What is this Interior Plain called that native Americans such as the Arapaho lived on (other than the Great Plains)?
Sentence (from "Native American languages of Wyoming"): Wyoming, a state in the western United States that straddles the intersection of the Rocky Mountains and the Great Plains, had been a part of the traditional geographic expanse of various Native American tribes: the Shoshone, the Arapaho, the Cheyenne, and the Crow.
Relevant evidence: No