This is just like New York. When someone mentions New York (the state) all people can think about is New York City. So it goes for Illinois. When Illinois is mentioned, most people only think about Chicago.
:-/ I should have gotten Jackie. That was one of the few I missed. But she was the subject of one the readings in the text book I used with some of my lower level students in Saudi.
https://en.wikipedia.org/wiki/Hillary_Clinton