One of the strongest scientific critics of racism in the U.S.during the early part of the 20th century was anthropologist:

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Franz Boas was a leading anthropologist during the early 20th century who strongly opposed racism and the idea of biological determinism. He argued that different cultural practices and behaviors were not innate to certain racial or ethnic groups, but rather were shaped by historical and environmental factors. Boas was known for his research on Native American tribes and his advocacy for cultural relativism.

One of the Strongest Scientific Critics of Racism in the U.S.during