Chicago's strongest midwest relationship is with...

Which city in the middle west do you think Chicago has the strongest relationship? To which are we most connected? I'm thinking in terms of... Milwaukee: backyard neighbor, our only one, with a similiar layout of lake, parks & beaches, and river St. Louis: 18th century rivalry for dominance in Mid-America that still lasts to today. Huge Cub-Cardinal rivalry. Besides, we live in a state that is attached to only two metro's: Chgo and StL Detroit: closest parallel to Chicago in late 19th-mid 20th c. industrialization and ethnic mix. Even by the 1950's, these two were frighteningly enough similiar to each other Cleveland: mainly because it comes across as a "Mini-Chicago" more so than any other midwestern city Minneapolis: many view Chicagoland and the Twin Cities as the most thrieving metro areas in the Middle West today Cincinnati: historical link related to Chgo/StL relationship. Cincy was the first city west of the Appalachians to be the great city of the west (prior to the LA Purchase). Chicago, obviously, holds that role today. Indianapolis: aggressive Indy has no qualms about going up against the Chicago big boys....as in fighting over the Big Ten tourney site. So which one of these major cities is most closely related to Chicago, has the most dominant relationship with our Windy City (and why did you choose it). If you want to throw in Kansas City and Columbus into the mix, that's fine (but, let's face it: I left them off here because their inclusion would be dubious, as best)>