To get free stuff you have to get free stuff. Why would you manufacture stuff, at great expense, when you're getting it for free? That makes no capitalistic sense.
The absence of capital controls is a political choice that people appear to believe is just a law of the world.
If there were capital controls then local manufacturing makes more sense.
It would kill the US stock market so it's unlikely to happen, but personally I don't see how unrestricted capital and restricted labour is anything but a recipe for disaster (the consequences of which we've seen in the US and Europe since the financial crisis).