Cornbread: Native Americans
I give you breakfast cereals, toaster pastries, hot pockets, grits, pumpkin pie, milkshake.
Coca-cola? do we now start to listen all types of drink recipetes?
So pure cultural, usa invented easy foods. This has very little to do with cultural foods like cheese, or the million types of sausages and breads and etc.
It does not amount to a considerable contribution to the culinary arts