There honestly aren’t a lot of people who aren’t generationally local in NE Wisconsin—but people will never, ever accept you if you’re from Illinois, specifically.
Seriously, though: you can be born and raised in NE Wisconsin and never truly feel accepted as a local. It’s such a lonely feeling.
crack the code, solve the crime
What is the least culturally powerful city where people do the "you're not a real [local]" thing, because New York is very very far from the only one