There are a few foods that predate colonization, and the European colonization of the Americas brought about the introduction of a large number of new ingredients and cooking styles that is proportional to the influx of immigrants from additional foreign nations.
When it comes to food, America gets a bad rap. It's a common refrain that America has no cuisine to call our own. We've got apple pie and hot dogs, but that's about it - and when you really get down to it, the Germans invented hot dogs, and the British were eating apple pie like... 1,000 years ago.
But there are dishes that one could call typical American, and we have invented some of the most creative, daring, and yes, downright craziest dishes the world has ever seen
Listing a few:
Corn dog - actually a hot dog, dipped in a cornmeal, deep fried and served in a stick
Philly Cheesesteak - plastic cheese called Cheese Whizz is a must. Also try French dip sandwich which is delicious.
Chinese food - yes, it's entirely an American creation and doesn't even resemble authentic Chinese food
Reuben sandwich - lol, there are indeed some people who think this is an international delicacy. Nope - invented in the USA
S'mores - I would have a hard time to even explain to my friends overseas what that is, and why we eat it here in the US.
Cobb salad - something that totally contradict the meaning of a healthy salad
Baked Alaska - interesting dessert, I didn't tried it yet, but it's on my bucket list
Turducken - such a brilliant-but-simple innovation
Totally American.
Chocolate chip cookie dough ice cream - invented by Ruth Graves Wakefield, now reinvented and significantly "improved".
Buffalo wings - staple at the bars, goes great with beer
Muffins - English muffins, actually
German chocolate cake - I never saw it in Germany or anywhere in Europe. Invented/originated in Dallas.
Doritos - invented in... Disneyland
French dressing, Russian dressing - just the names
Chimichanga - no, it's not Mexican. Invented in Arizona.
Eggs Benedict - on English muffin, a traditional American brunch or breakfast dish.
Peanut butter and jelly sandwich - warning - you will be fighting to get the sticky goo off the roof of your mouth. Beloved sandwich in the US.
Breakfast burrito - was invented in Santa Fe, New Mexico. Popular breakfast food. Also street food.
Sandwich bread - typical American, not recommended, though, to people who know how real bread taste
BBQ - has been a staple of American culture. There are many styles of cooking, and subcultures with wide variation between regions.
American pizza - bearing only a casual resemblance to the Italian original. Iconic dish of considerable popularity. Try it.
Cornbread - common bread in US cuisine, particularly associated with the South and Southwest.
Hushpuppy (or cornbread ball) - frequently served as a side dish with seafood and other deep-fried foods.
Crab cake - crab meat and various other ingredients, such as bread crumbs, milk, mayonnaise, eggs, and seasonings.
Note: in the US, size of the dish matters more than quality. And in general, restaurants are looking not for what is good food - what is good is what sells. GENERALLY, the cuisine pervasively sweet, and salty, and fat. They eat sweet breakfast, drink sweet drinks with every meal. Love cookies, cakes and muffins. Love fried food. Love salt.
Watch your waist while eating here, OP.