Americans have always been ambivalent about immigration, with realistic concerns bumping into altruistic, even romantic notions. The romance is summed up in the inscription on the Statue of Liberty, erected in 1886, proclaiming the famous lines ''give us your tired, your poor, your huddled masses yearning to breathe free.'' The ambivalence was expressed a mere four years earlier, when Congress enacted the first immigration restrictions, specifically excluding "paupers, ex-convicts, mental defectives and Chinese." That was at the beginning of the greatest wave of immigration in American history, which brought in 18 million new citizens, diversified U.S. society and gave us the enduring analogy of the ''melting pot.''
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