National US Labor Policy - Effects on Sunbelt

If US labor policy were decided at a National level and each state this had the same labor law, how would this impact sun belt population growth going forward if southern states had the same laws and northern states on labor unions throughout the 20th century and there was no cheap internal relocation option for manufacturers who want a more favorable regulatory environment?
 
I think that many would actually move out of the US if the labor laws were stringent. Now if the labor laws are weak, there won't be any problems.

Now there'd need to be many changes to have labor issues decided on a federal instead of state. There would need to be some divergence that would make labor laws the responsibility of the federal gov. Otherwise, if they intervened, there'd be backlash and many would view the gov. as "intervening" in state affairs.
 
Cheap land, cheap oil, built up infrastructure courtesy of WWII and the New Deal, and a climate that's tolerable thanks to the invention AC means the Sun Belt was primed to grow, Right to Work or no Right to Work. I don't think it impacts the growth of the sunbelt that much, maybe a few companies stay in the North rather then move, but they're going to follow the people and the people are going to move South.
 
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