Then we have no choice, really, other than conscript them as soldiers and send them home. There are gonna be more than a few countries regret sending us millions of folks they had no use for. We have no choice but to find a use for them. Leaders throughout history have had no problem putting such folks to good use.
Their use is as CONSUMERS, not workers; whole school districts would be closed already without a steady stream of young foreigners to replace the American children we won’t breed. In fact, those same school districts would be ghost towns as demand for housing evaporates in areas that haven’t had jobs in decades.