If some one decides to build a car factory in the US ,there are many things to consider.
Firstly,you can not start building and selling cars tomorrow.
Building a large factory will take 2 years and a whole lot of money.
What can change in two years?
Flip flop tariffs,may or may not last ,may or may not go up or down.
Trump may be gone for a number of reasons.
Those cars will be only sold in the US because other countries will be putting tariffs on that also.
It is a mess and it will only get messier.
Trump is going to destroy the US economy,well you get what you voted for but almost the same amount of people voted against him and every one now has to deal with the consequences.
A lot of countries are looking to buy arms elsewhere now.
Not soon but very soon some people will get very tired of winning i can assure you.
I said it before,how long can you keep defending the undefendable?
US citizens ,start paying off your credit while you still can,you could be homeless in six months.(then donald will put you in a camp for your own good)