Question: What Illinois city are the headquarters for the league that the Western Illinois Leathernecks play in located in?
Sentence (from "Summit League"): The Summit League, or The Summit, is an NCAA Division I intercollegiate athletic conference with its membership mostly located in the Midwestern United States from Indiana and Illinois on the East of the Mississippi River to the Dakotas and Nebraska on the West, with additional members in the Western state of Colorado and the Southern state of Oklahoma.
Relevant evidence: No