Perhaps we should rethink the current U.S. anti-immigration actions?

You will not enjoy the consequences. Cutting off immigration will lead to declining population, whether this year or in the near future, and that will mean fewer workers, especially in immigrant-heavy industries like farming, construction, and caretaking, which in turn is likely to mean higher prices for the kinds of goods and services no one can go without. A shrinking population will mean a shrinking future.