Donald Trump said:

“we’re gonna get Apple to start building their damn computers and things in this country, instead of in other countries”

John Gruber digs in to the logic:

The U.S. can’t compete with China on wages. It can’t compete on the size of the labor force. China has had a decades-long push in its education system to train these workers; the U.S. has not. And the U.S. doesn’t have the facilities or the proximity to the Asian component manufacturers.

The only way these jobs are coming back to the US is via legally mandated means (a government tariff or trade restriction of some kind). Economically, it just doesn’t make sense, or the jobs would never have left.