Apologies to non-Americans who don't care.
Sometimes you see patriotic campaigns to "buy American". I wonder what it would be like to eat American and only American food. It would be a bit more expansive than a locavore's notion of stressing local ingredients. You can only eat plants, animals, and other food sources that are grown or raised in the US, or products derived from such. The idea is that you look beyond the obvious meat, seafood, or produce and also consider the other items also used in cooking.
How would you adjust cooking at home? You could still use techniques and ideas borrowed from other cultures, but no imported ingredients. No olive oil from Mediterranean countries. No foreign wine or cheese. No produce from Mexico or Central America. No seafood caught by fishing boats not based out of a U.S. port. Things like Asian greens grown on an American farm are okay and encouraged.
Could you do it for a month or two? How about a year?
Would you be willing to try a restaurant whose notion of fusion was to take the ideas and techniques of a tradition such as Japanese or Italian cooking and modify that to embrace a 100% American ingredient list, with creative substitutions dictated by that constraint?
Just to be clear, I don't think this is an idea that people should adopt. If you want to, I won't think badly of you, but it's not my agenda. This is more of a thought experiment intended to see if it inspires any creative ideas.