What idea was expressed in The Passing of the Great Race by Madison Grant?

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Madison Grant argued in The Passing of the Great Race that immigrants from southern and eastern Europe were mentally and morally inferior and posed a threat to the strength of American society. He believed that the superiority of the white Anglo-Saxon race was being diluted and that strict immigration laws were necessary to preserve the country's racial purity. This view was widely embraced by eugenicists and others who believed in the pseudoscience of racial hierarchy.

What Idea Was Expressed in the Passing of the Great