It's actually very normal and it's not really *regions* within a state generally that are so different as much as it's population centers vs. rural voting areas with lots of land and few people. Minnesota is a little different than most Midwest states, but I'm not at all surprised you saw all those Trump signs in rural areas of the state. Very likely Harris will still win that state by 6+%. Same story all over the midwest when the vote from a few big cities just swamps the rural vote. Heck, most of Illinois is reliably conservative and yet it easily goes for the Democrat every time because of Chicago and 'burbs.
