Here is a great article explaining regional pizza styles across the country. It's interesting that they mention Chicago thin-crust pizza. Be sure to read the comments..... lots of good insider information. Below is what one commenter said about it.
"Thanks for acknowledging Chicago thin-crust. Far more Chicagoans eat that style than deep dish -- that stuffs mainly reserved for the tourists."
I happen to agree with him, it's my favorite style.