Well, most of "American" foods are from the UK.
Americans who grumble about Brit food and Brits who do the reverse, are morons who don't know anything about what they're grumbling about!
I love going to The Guardian cooking pages. They love American food but it brings out the xenophobic crazy Brits like you wouldn’t believe! It’s amazing how British cookery magazines push not only American food but American holidays like Thanksgiving and Halloween. They still seem a little shy about pushing the 4th of July, lol, but I expect that’ll be next!