I am not sure this is 'as American as apple pie' but there is something like spicy French food in the USA
https://en.wikipedia.org/wiki/Cajun_cuisine
From the French immigrants living in Louisiana.
Talking a side step, talking about American fast food. Actually Pizza is Italian. I am not sure if Hamburger is German, but the name is. And the donut, that is just a Dutch oliebol with a hole in it.
Native American food is American Indians' food .))) However , if you are finding food of modern American people , you will find a very big quantity of different meals , because as I think it's just a mix of recipes , which Modern Americans' antecedants bring to New World with themselves. Perhaps this variety of cultures made its own original cooking. Maybe i'm wrong , not know...