Question: Which Midwestern Native American tribe, who settled near the confluence of the Missouri and the Mississippi rivers, is represented by mascot Chief Big Track at Arkansas State University?
Sentence (from "Omaha people"): The Omaha Indian Reservation lies primarily in the southern part of Thurston County and northeastern Cuming County, Nebraska, but small parts extend into the northeast corner of Burt County and across the Missouri River into Monona County, Iowa.
Relevant evidence: No