They projected this belief back onto the etymology of the word mulatto.

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Sollors points out that this etymology is anachronistic: "The Mulatto sterility hypothesis that has much to do with the rejection of the term by some writers is only half as old as the word 'Mulatto.

The persistence of some authors in using this term, anachronistically, reflects the old-school essentialist views of race as a de facto biological phenomenon, and the 'mixing' of race as legitimate grounds for the creation of a 'new race'.