Building a new factory needs a few years from idea to start of planning to production. 2 years if you are really really quick maybe, 4 to 6 years might be more realistic. The term for the current administration ends in 3.5 years and the next one probably won't be lead by Trump, so things will change.
This means that nobody will even start moving production back yet, they will pay lip-service, do the minimum to get along for this term, and hope for the best for the next one.
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