It would only be sustainable if we got rid of every governmental program that acts as a “safety net” (ex: welfare, public healthcare, etc…) If we had no governmental programs than completely open immigration would be feasible. However, I do believe that having some sort of legal immigration that allows people from other parts of the world to become full fledged citizens is a necessity, and we cannot extend our constitutional rights to anyone who crosses our border (ex: the right to vote).
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