Well, the Middle Eastern* population in Michigan is not spread around, so picking a university in MI on that basis isn’t really going to do him any good anyway.
I don’t know your background, Paul, so I’ll hit on something that has been mentioned previously. Summer classes in college, at least here in the States, are a completely different environment. There are many fewer students on campus, the classes go twice as fast, and there is not nearly as much of the College Experience going on. If he wants more flavor, a fall or spring semester would be far better than summer.
Central Michigan University is about as Middle American as you can get. It has a high girl-to-guy ratio, especially if he wants to take classes in sociology or psychology. It has about 15,000 students and is a teaching college rather than a research college; the quality of the education is dependent on the student. Because it’s not a top-ranked school, it gets a number of high caliber foreign graduate students who don’t quite have the English to go to more prestigious schools. (E.g., I knew a Master’s student from China. She was studying econ. Her GRE math score was perfect, but her English wasn’t, so she ended up at CMU.)
Another option is Michigan State University, a virtual city unto itself. It draws from all over—one of the guys in my sister’s MBA program was being paid by IBM to be a full-time MBA student—and has a diverse student body. It is in East Lansing, right next to the state capital, Lansing, so he’ll have access to some city life and still have access to non-city life as well.
So, I guess I’m suggesting MSU because it is very much a midwestern university, but it still draws from a wide swath of the States. He’ll have access to some form of American city life, yet he’ll be a short drive from the rural countryside and agriculture that seems to be such a large part of the American spirit. It’s a great school, and he’ll have the opportunity to meet students from his part of the world so have some break from the culture shock; yet he won’t be someplace where the international presence is inescapable.
*I had an Iranian student who referred to himself as a Persian.