The argument that josiah c. nott and george r. gliddon made in their book types of mankind is that blacks formed a separate species that fell midway between whites and chimpanzees.
The main idea of the book, Types of Mankind was that different human beings have different origins. Theories such as these were an important foundation of scientific racism, asserting racial differences in American culture in the late nineteenth and early twentieth centuries. It was used increasingly to justify slavery, racial stereotypes, and legal politics. Physicians in the U.S. used the Types of Mankind and its scientific racism to argue the inferiority of blacks and their supposed predisposition to enslavement.
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