The Hart-Celler immigration reform of 1965 is sometimes overlooked amid the tidal wave of legislation that flowed through Congress that year. It overturned the “national origins” system, passed under the Immigration Act of 1924 and reaffirmed in 1952, that had aimed to keep the ethnic composition of the United States roughly what it was. Even in the mid-1960s, immigrants from Britain and Germany made up more than half of national “quota” immigration—and those countries plus Ireland, Italy, and Poland accounted for almost three quarters. It is hard to say exactly what the bill’s backers
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