I was thinking the same thing. While the US is a melting pot and a lot of food we do have has been lost in translation (there's nothing like authentic German, Italian, French, etc food!) I think the US does have some signature dishes depending on where you are from. When I think of "American" food I think of home cookin' straight from my Momma's kitchen. I'm from the Midwest were steak and potatoes is a staple (or meatloaf or pot roast). You've got fried chicken and cajun in the South and seafood in the East. I'm sure I'm missing a whole lot of other choices and I don't even know what Westerners eat.
However I think to do "American" food correctly you need a TS place. And better yet......let's make it a buffet. Oh geez, now I'm cracking myself up...........
Back to my point.....I think SOMETHING could definitely represent American food a little better than a "McDonalds on steroids". Or.......maybe not?!?!? Is that what we look like to other countries????