Google BRAC.
Well, Ford can't open any plants anywhere in the USA (and thereby take advantage of cheaper wages) because their contract with the UAW REQUIRES them to pay full union wage no matter where their factory is.
Therefore, Toyota, Mitsubishi, Kia, et. al. can open plants in the south, but Ford and GM would gain no advantage by doing so.
And Ford cannot CLOSE any factories until the union contract with them runs out. (So money-losing factories
must be kept running even when they are unprofitable.)
Result: US auto makers are going the way of US TV makers.
China will introduce a new car and within ten years all of us will be buying our cars at Walmart.
(but don't blame the unions!)