The most universal parts of American cuisine tend to be the desserts, I don't think there is an American out there who hasn't had an Apple or Pecan pie, or Cookies or Brownies. Hell, Pumpkin pie, Key Lime, Blueberry, Rhubarb, the half dozen or so different types of cream pies, or even cobblers. Then you've got Banana Bread, Blondies, German Chocolate Cake, the infamous Fruit Cake, Gingerbread, Pineapple Upside Down Cake, Buckeyes, or even Doughnuts. A shitload of sweets are universal, quite a few from Europe, but taken and made our own so to speak.Pie is pretty damn American I think. I wouldn't know really since I haven't been to any country outside of the U.S.
I'd include a lot of regional stuff, as long as it falls within the US. A lot of Cajun cooking, Tex-Mex too. Honestly, strange as it is, I don't get a lot of lamb around here. Definitely should be on the list though.Lamb. In 2017, 150 millions pounds were produced compared to 80 million pounds of veal. https://www.meatinstitute.org/index.php?ht=d/sp/i/47465/pid/47465 Gator meat is too regional to be considered a staple of "American" cuisine. Florida or Louisiana sure, but virtually unknown in Idaho, Maine, or Alaska. Gator production would be measured in the tens to hundreds of thousands. The only number I found was 800,000 pounds produced globally.
For veggies you need to include peppers. Bell peppers are a top 10 veggie on any list and jalepenos are included as toppings on burgers, chili, nachos, hot dogs, and burritos to name a few.
Peppers and Jalapenos are two other big screw-ups. Too obvious! I'm curious about how popular turnips are. My family never touched them, but they're everywhere.