People outside the US and other Northern European lands wonder why we live as long as we do. This thread supports the response, “I have no idea. We should be dead before we leave our teens.”
Well, in Atlanta we have Coca-Cola. Y’all ever heard of that stuff? 
I just found out a few weeks ago that chicken biscuits are a Southern thing. They seem pretty innocuous to me, but both my friend from Massachusetts and a friend from Germany that had lived in Ohio both think they’re weird.
I’ve heard that breaded pork tenderloin sandwiches are an Indiana thing. Lots of places here (NE Indiana) have them but I haven’t seen them anywhere else. Not that I’m looking for them though, don’t really care for them.
Also parts of Southern Illinois and Iowa. They are awesome. Basically, just a pork schnitzel on a bun.
Yes, they are. I ate one last week when I was up for my class reunion. Everybody there thinks that they’re available everywhere.
Another thing that was pretty much a regional thing when I grew up in NE Indiana, was chicken or beef with egg noodles over mashed potatoes. Talk about carb overload, but they are still comfort food to me. 
Another regional dish from the Nashville area is chess pie. Chess pie - Wikipedia Nom!
I miss the tenderloins from Hoosierland. Nobody’s mentioned the IN state pie yet- sugar cream pie.
Around here in S. GA, they’ve got cheese straws ( http://www.foodnetwork.com/recipes/paula-deen/zesty-cheese-straws-recipe/index.html ) and pimento cheese ( http://allrecipes.com/Recipe/creamy-pimento-cheese/detail.aspx ). Both of these are pretty blah unless they’re kicked up a few notches with capsaicin.
Dude. In Chinese they call it Peanut Butter Ice Cream, but that’s misleading. It’s a tortilla-like wrap containing peanut brittle shavings (more delicious than it sounds) with three scoops of ice cream, one each in taro, pineapple and (I think) coconut or vanilla, plus some coriander. The perfect dessert food.
Wegmans in Central NY and maybe other places carries Hofmann’s natural casing hot dogs, and Hofmann’s Snappies, or coneys. Looks like a white hot dog, made with veal and a dash of nutmeg. I was surprised they are unknown elsewhere, though I guess they’re a variation of some kind of German wurst. These, and some salt potatoes, are a vital part of our weekly barbeque.
I miss these a lot. I also never tasted Brats better than the ones I had in Indiana.
I grew up in El Centro, CA. Which is just 6 miles north of Mexicali, Mexico. It is the only place you can get a Special Quesadilla. Oh my goodness are they good.
in my present dig:
meat pies!
I had huckleberries with chilled silver tequila deep in the heart of Cajun Louisiana.
It’s not like broccoli is going to appear in a thread about unique local cuisine.
Northeast Ohio (Youngstown area – Hello Italians!) has Brier Hill Pizza which is just crust, sauce, Parmesan/Romano sprinkling and fried peppers.
Also Wedding Soup was unique I think, but Progresso got a hold of it so not anymore.
Cod tongues - today usually pan-fried and served with cooked potatoes and a salad of some kind - has been a seasonal dish in coastal Northern Norway since Norwegians started exporting cod. i.e. roughly since the middle age 
In western NY we have Loganberry. It’s a sweet non carbonated drink.
Is Chiavetta’s marinade found outside WNY? It’s well known enough around here that churches selling chicken bbq will just call the event a Chiavetta.
Not as far as I know–at least I’ve never seen it outside Buffalo.