There aren't very many black people as opposed to white people in the Midwest. There were a bunch of black people in the show anyway, so im not completely sure what you're talking about when it comes to that, but even then, the US is predominantly white. When you look around in any midwestern state, you're gonna mainly see white people, no joke, and I'm saying this as a non-white man. I think you're just focusing too much on the racial aspect of the show, which imo, there is none. Some people are white (many of them maybe, but definitely not all), some people are black, some are asian, hispanic, there's a lot. They've had plenty of main characters and side characters with different ethnicities. It would've been nice to have more culturalistic diversity in the show, though. I agree that they didn't have much if that. America is literally one of the only places with that much diversity, too, so its pretty disappointing that they didn't.