I used to ask my wine knowledgable friends if they could drink wine from only one country forever what would it be. I got some deep thoughts, and then they all said France because no other country has anything comparable to Champagne. Several really like Italian wines in general, and US wines as well.
As for food, I like a lot of diversity, so sticking to one country's cuisines would be tough for me.
The food I think of typical in the US would be things like turkey and dressing, grilled steak, barbecue (the real kind), shrimp/lobster/fish (common around the world). Turkey and BBQ are almost uniquely American, I'd add pork chops to that almost.