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.
The value of a consumer evaporates quickly in the least scarcity. The value of a SOLDIER, however...
Think about it. We have millions of people here who are “highly fluent” in various foreign languages and very familiar with the customs and terrain of the lands from which they came. Many of these lands are homes to a select few of the world’s wealthiest people. Hmmm..... What in the world can you do with a 25 year old (fill in the blank) that was useless to his home country? SEND HIM AND A THOUSAND FRIENDS BACK WITH RIFLES.
EMPIRE OR DIE. That is the choice we are left with thanks to LBJ, Carter, Clinton, Bush, Obama.