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Answer: Magic.
Unfortunately the folks in charge of US policy at the moment have no idea how anything in the real world works, so they just openly engage in magical thinking, that the world will change on a dime because they deem it so.
The food will just be made by Americans now. That's the long and short of the answer. They don't worry about little things like how exactly that will happen, how an army of Americans will show up to the fields literally tomorrow.
