Well yeah, but just as "British food" means universals like fish & chips or a Sunday roast, with subcategories like Welsh or Scottish or Yorkshire-specific food

Well yeah, but just as "British food" means universals like fish & chips or a Sunday roast, with subcategories like Welsh or Scottish or Yorkshire-specific foods, there's a broader "American food" category with other subcategories that don't necessarily fit the bill. Creole food is one of my favourite cuisines and isn't over-sweet, for example. But so much American food just tastes over-sweetened to me when I was just eating random things from the supermarket or takeaways or restaurants on my various trips over. Pizzas, drinks, anything involving bread, breakfasts, that sort of thing. Obviously there are exceptions but it's something that really stood out to me. Even mass-market food with direct equivalences (McDonalds, Pizza Hut, Mountain Dew) that we have over here, were much sweeter in the US.