Foxconn moving to the US is not as easy as you make it out to be in your post. Apple will never be a manufacturing company.Apple could do it if it wanted to. It just likes its profit margins too much, that's all.
Moving production to the USA would be a tremendous jobs creator. You'd actually see a substantial jump in GDP. That's how big of an effect it would be.
However, there's something else that your statement reveals: that it would cost more here. You mean that it would reflect the reality of a fair wage with worker protections vs the worker abuse that occurs in China?
Apple could readily eat the additional cost and make these products here in the USA. They just choose profits over people, that's all. You underestimate the production efficiencies that could be reached in the USA.
And as far as Apple eating the cost, you could certainly take a pay cut and still put food in your mouth? Right?
As far as worker abuse, still exists in the US, so what is your point?
Apple doesn't choose profits over people; that is a meme at this point. What Apple did is they chose a manufacturing partner that will work with them as needed.