Minnesota is not considered "Rust Belt". It is "Midwest". Not much heavy manufacturing in Minn. They mined the iron ore and sent it by ore carriers to steel plants and heavy manufacturers in Wisc, Ind. Ill, Mich, Ohio, Pennsy, and NY. Those are the Rust Belt states. Minnesota was technology way back when with Honeywell, Control Data, and Cray supercomputers.
You left out Iowa, Missouri, Kentucky, and West by God Virginia. There may be others in areas (New England) that I did not haunt in my previous lives. Iowa is flat, so no biggie. Kentucky and WV are worthwhile.