Apple is a company that sells its products all over the globe and happens to manufacture many of them in China. They're also unusual in the context of any discussion about manufacturing because they have enormous global sales figures but don't really employ a lot of people because they manufacture small things in highly automated processes. Because of those considerations, they're actually one of those companies that could manufacture things in the U.S. and still be very competitive.
But they are wholly owned subsidiaries I think….and set up for the express purpose of developing entire cities of Apple mfg. This is the secret sauce for their efficiencies….and for purposes of this conversation, those subisidiaries can be considered part of Apple. So no, they could not duplicate this success in America…..more for reasons of regulations and logistics than just pure wages.