The book, On the Natural Variety of Mankind, formally proposes a notion of:

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The book, On the Natural Variety of Mankind, proposes a hierarchy of human types, dividing humans into different races with varying levels of intelligence, physical ability, and cultural development. This reflects a belief in racial superiority and inferiority, contradicting the idea of relative human equality. Additionally, it does not necessarily address the idea of race as a social construct or human racial adaptation.

The Book, on the Natural Variety of Mankind, Formally Proposes