PA has "Altoona style" and "Old Forge style", both hailing from miserable coal bust towns and consisting more or less of a slice of american "cheese" and red sauce on a sheet crust, I think one has a green pepper under it.

you will live as long as you steer clear of Altoona pizza

So what region does Grandma style pizza belong to?

This popped up in my recommendations yesterday. There's a ton of regional styles I've never heard about. Ohio Valley is in there. At least that's recognizable as pizza. Some of these stretch the definition pretty thin.

Every Pizza Style We Could Find in the United States