Question: This group of natives in North America were indigenous to the Interior Plains, historically nomadic, and relied on bison hunting.
Sentence (from "Bison hunting"): The species' dramatic decline was the result of habitat loss due to the expansion of ranching and farming in western North America, industrial-scale hunting practised by non-indigenous hunters, increased indigenous hunting pressure due to non-indigenous demand for bison hides and meat, and even cases of deliberate policy by settler governments to destroy the food source of the native Indian peoples during times of conflict.
Relevant evidence: No