In 5500 years Michigan is mostly a site famous for it's tin extraction, which is sent down the Mississippi. It's mostly the same as it was 1492, although there are a number of bronze tools floating around, and it's a tiny bit more heavily populated.
Michigan is actually an independent nation in my TL, the Third Pistol (see sig). A pretty huge one actually, comprising Rupert's Land, Wisconsin Territory, and half of Oregon Country.
Hey, don't worry - I haven't yet figured out how Michigan would fare in my TL, but I can promise you that it would probably be better than it is in OTL.