Crossword puzzle clue "chicago's state"

Actor Jon of "Chicago P.D." and "Chicago Justice"

Illinois, Indiana, Iowa, Michigan, Michigan State, Minnesota, Northwestern, Ohio State, Penn State, Purdue and Wisconsin

Chicago's state: Abbr.

State park southwest of Chicago

Chicago's state

Article of tropical apparel ... whose start is a state nickname for the state indicated by the circled squares

Unlikely state of a state?

Secretariat's mother, for one ... whose start is a state nickname for the state indicated by the circled squares