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If you have free immigration, in the way we had it before 1914, everybody benefited. The people who were here benefited. The people who came benefited. Because nobody would come unless he, or his family, thought he would do better here than he would elsewhere. And, the new immigrants provided additional resources, provided additional possibilities for the people already here. So everybody can mutually benefit.

"Illegal Immigration: A Feature, Not A Bug, Said Milton Friedman" by Brian Doherty, reason.com. May 11, 2011.
If you have free immigration, in the way we had it before 1914, everybody benefited. The people who were here benefited. The people who came benefited. Because nobody would come unless he, or his family, thought he