Anonymous, let's say that Tesla and Hyundai built factories in a couple of years. How many years of planning went into that decision?
Let's be generous and say 3 - 4 years from conception to manufacturing. That's Trumps time in office done, unless he changes the laws , which is possible. You are also assuming that all companies will play Trumps game.
It's more likely that the rest of the world will never trust America again and take measures to ensure they are not put in the same position in the future.