As far as every day, commoner food, when I think American food, I think:
Chocolate-dipped Soft-Serve ice cream
Pickled watermelon rind (watermelon is really a cucumber, anyways, so it makes sense)
Baked Maine lobster
Key lime pie
Chicken and waffles
Root beer float
BBQ Chicken and red onion pizza
New England clam chowder
General Tso's Chicken
Shrimp and grits
Are you just thinking of fast food, or the stuff we serve as novelties at once-a-year fairs?
There are few things I don't like to eat. I'd say brussels sprouts, some mushrooms (just the button ones. I like portabello, chanterelles and asian mushrooms), and chauliflower most of the time are my red lines. Everything else for the most part gets consumed.
Cilantro is fine when used sparingly. The problem is when people use too much and the bitterness overwhelms the other flavors in the dish.
Me, I have difficulty with oysters - particularly raw, but one time when I was eating an oyster stew the edge of my spoon encountered an oyster and it burst like an over-ripe zit. Urgh.
I'm allergic to scallops - which was particularly fun when I was a kid and I had to eat them. (My folks thought I was faking each time I got sick after eating them.)
Most melons - yuck. I have had one which I quite liked but it was a Xmas around our friends house so do not know its name - he assured me it tasted different and it did - nice. But I avoid all melons anyway.