You also have to take into consideration that Chicago has always made less guys and NYC has five families, all with more guys now than Chicago had at even their highest numbers in the fifties and sixties.
This argument doesn't work because even smaller families than NYC such as philly, new england, jersey, ect has had way more rats than Chicago and they're smaller.
Of course there are rats in Chicago but there's no denying that the numbers are far less compared to other cities.
