Neither will _modern_ manufacturing plants. Regardless, unemployment has not been a big problem in the US so far, and if you say that the recent mass gig/under employment is no longer sufficient for (american dream|middle class lifestyle|male ego), then the sweatshops and coal mines won't be better at all.
The global demand for USD puts downward pressure on the price of US goods.
Unemployment is roughly 4%.
It doesn't matter. Even if zero new jobs are created, it still represents a capital investment in robots and lights-off factories to increase national security going forwards.
Then why allow over 10 million illegal immigrants?