Where did the Indigenous peoples of the Great Plains live?

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The Indigenous peoples of the Great Plains inhabited a vast grassland region in North America, spanning the area between the Mississippi River to the east and the Rocky Mountains to the west.12

Geographically, this territory extended from the Canadian provinces of Alberta and Saskatchewan in the north down to Texas in the United States. The region is characterized by a continental climate and is drained primarily by the Missouri and Mississippi river systems, where tree-lined river valleys historically served as essential sites for water, wood, and food resources.132