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Polygeny had European antecedents, but Americans developed the data to solicit popular support based on a large body of research they conducted to formulate its tenets.
See generally Stephen Jay Gould, American Polygeny and Craniometry Before Darwin.
Gould, Stephen (1993) "American Polygeny and Craniometry Before Darwin.
Polygeny, as we are discovering, accounts for much of the variable expressivity observed in many, perhaps most, "single-gene" traits.