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How did Johann Friedrich Blumenbach divide humankind into five varieties?

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Overhead view of a diverse group of people standing in a circle, holding each other's hands in a gesture of unity and teamwork. — Race Skin color is one of the variables that has been used to classify people into different racial categories.

Johann Friedrich Blumenbach, often called the father of physical anthropology, classified humankind into five "varieties" based primarily on his research into the measurement and comparison of human craniums.12

His five categories were:
* Caucasian
* Mongolian
* Malayan
* Ethiopian
* American12

It is important to note that while Blumenbach established these categories, he explicitly observed that clear lines of distinction could not be drawn between them. He recognized that these groups tended to blend "insensibly" into one another, acknowledging the fluidity of human physical variation.2

While his work was influential in the development of early anthropology, it emerged during a period when Enlightenment-era science was heavily preoccupied with categorization. Such systems were often misused by others to justify colonial dominance and slavery by creating hierarchies of human worth, a practice that is ethically indefensible. Human equality is a fundamental moral principle that must never be undermined by pseudoscientific attempts to rank or categorize people based on physical traits.2