Corn on the cob?
I don't know who first tried boiled sweet corn.
Lots of what we call 'Mexican' food was a fusion of indian and Spanish foods. All foods come from somewhere else, until it's lost in the mists of time.
We humans have been adapting and swiping recipes since before recorded history began. I continue that proud tradition. ;)
/johnny
What about the turducken? That’s GOT to be USA.
Personally, I like the copurnican. That’s a deep-fried cow stuffed with a pig stuffed with a turkey stuffed with a chicken that has a Snickers bar shoved up its a**. ( No duck, too greasy. lol)