With the passage of the Immigration Act in 1924, the United States closed the door at Ellis Island. We went from allowing more or less unlimited immigration to a harsh country-by-country quota drastically cutting the number of Jews, Italians, Greeks, and Eastern Europeans that could enter the country and banned East Asian immigration completely for the next 40 years. Our guest. Daniel Okrent, says it was the end of a decades long campaign eugenics movement using a junk science that claimed certain races and ethnicities were morally and genetically superior to others — all to keep America from being overrun by nonwhite people. Sound familiar?  

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THE GUARDED GATE: Patricians, Eugenicists, and the Crusade to Keep Jews, Italians, and Other Immigrants Out of America