Minnesota: breaded walleye sandwich, no doubt
Apparently, the one time Midwestern favorite ‘hot beef sandwich’ (roast beef sandwich served with a scoop of mashed potatoes and covered with gravy) has become little known, perhaps replaced by the ‘hot beef sundae’, which isn’t a sandwich
Hot beef sandwich with hashbrowns
That’s known as a Beef Commercial in most of Minnesota. Supposedly it was the favorite of traveling salesmen. It’s my favorite. Nothing beats mashed potatoes slathered in beef gravy with tender roast beef.