Re: Why California?
Tesla uses a LOT of robots in their plant, for which cost of living doesn't matter. I could see companies like Apple moving a lot of manufacturing back to the US as it becomes more automated, to score political points (not just with Trump, this was something on the radar before him and will be after he's gone) though obviously it won't have the effect that people stuck in the 70s/80s like Trump expect since the jobs created will be high tech jobs not blue collar manufacturing.