In Edward McCleland’s book How to Speak Midwestern, there’s a lot to learn about the intricacies and subdivisions of the American Midwestern accent. Take this article, which McCleland adapted from the book, on the history of how the folks in St. Louis speak:
In 1904, the year it hosted the World’s Fair and the Olympics, St. Louis was the nation’s fourth-largest city, behind New York, Philadelphia, and Chicago. It was a center of brewing, milling, and meat packing, and a magnet for Irish and Italian immigrants. That gave St. Louis, and its dialect, a more urban character than most other Midland cities. For example, older St. Louisans still say “youse” and substitute ‘d’ for ‘th.’
That urban characteristic affects not just the vocals of (older, at least) St. Louisans, but everyone’s attitudes:
St. Louis feels more connected to Chicago than it does to the rest of Missouri, which it regards as a hillbilly backwater. A St. Louisan is far more likely to visit Chicago than Kansas City—or Branson, for Pete’s sake.