[Clemenza]

The northern half of the Mississippi from Minneapolis to around Cape Girardeau is heavily industrialized (and unionized). The Misssissippi south of Missouri is heavily black.

[cogitator]

The northern half of the Mississippi from Minneapolis to around Cape Girardeau is heavily industrialized (and unionized). The Misssissippi south of Missouri is heavily black.

That explains it. I was less certain about the northern Mississippi than the southern.