No ranking. They're too different to compare. So, in no particular order:
New Mexico: Enchiladas (or anything else) with the green chiles that only grow right in New Mexico.
Maryland: Crab cakes (crab soup close second). Crab cakes do not contain bread crumbs.
Missouri: KC Burnt Ends.
North Carolina: Pulled Pork. (VA does this well also.)
Ohio: Skyline Chili. Not Gold Star. No way.
Louisiana: Gumbo. Or maybe a shrimp po' boy.
California: Sushi. Or fish tacos.
Colorado: STEAK. Seriously: best steaks I have ever had in the United States were at family-owned, one-off places in (mostly) western CO.
Virginia: Salt cured Smithfield ham, and anything derived therefrom.
Wisconsin: Johnsonville ... brats, etc. Cornbread battered walleye.
Some things like BBQ and fried chicken are regional, and can't really be associated with one State.
I can't go to New Orleans without a debris po'boy from Mother's and Creole bread pudding soufflé from Commander's Palace.
"Ever picked the shavings off a freshly carved roast? When a customer asked Simon Landry to add the bits of roast beef that had fallen into the gravy while he was carving it to his sandwich, he replied “you mean some of the debris?” And just like that, another definitive Mother’s term was coined."