Michigan has a mere 11 counties that swung for Biden, yet they had enough population to make up over 50% of the vote, while the remainder voted overwhelmingly for Trump; by 70% margins or more in most cases. And the blue counties are mainly a cluster in the South and SouthEast part of the state; Detroit, Ann Arbor, Flint, Lansing, Grand Rapids, with just a couple of outliers to the north, notably Marquette county, home to a big college community.

What you see in Michigan is huge rural sections of the state where the voters are overwhelmingly white, blue collar, and with a low proportion of college education, voting Trump; while the urban areas, where there's a large proportion of Hispanic and Black voters, more professional and service industries, and notably where the universities are clustered and where people are more likely to have either been to college or at least have family members who have, voted for Biden. My county is one of the 70% red ones, and only 30 miles away from a huge Democratic stronghold where the vote was 80% for Biden. You could almost see the difference crossing the county line.

I have a suspicion that this is the sort of divide that's going to be found almost everywhere when the analysis is over.