Or that Americans aren't willing to work for the prevailing global wage that manufacturing workers demand. Why would any company keep manufacturing here when labor is so expensive? Effective manufacturing robots would allow manufacturing to move back to the us.
How could this possibly work for, e.g., electronics? How does the government buy computers that are made in America? Unless there is some loophole whereby all the parts are acquired from wherever they are acquired, and the manufacturer just assembles the box in the US and gets to label it "Made in USA"?
I'm guessing this comment got down voted because Americans are against immigration in general. But whether its a good idea or not the fact remains that our desirability as a place to live could be used to satisfy any labor shortage.
The implication of that in turn is that these US companies aren't willing to pay at a rate that would be competitive in the market