In any case, even foreign car manufacturers (Mercedes-Benz, Toyota, etc) can afford American labor costs. And car manufacturing is much more labor intensive then phone manufacturing.
Cars are a different issue. Import taxes, tranportation per unit cost, storage, distribution are all significant components of localized manufacturing. No Americans would be interested to do small part assembly work at the Chinese pace, live in a dorm, nor for that matter pay $1500 for a disposable gadget. In the US one would have to work with the unions, American coffee breaks would halt production and fat people (the majority) with sausage-sized fingers will sue for being discriminated for not being able to participate. Forget it.