Which early sociologist received the first doctorate ever awarded by Harvard University to a person of colour?

Question

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W.E.B. Du Bois received the first doctorate ever awarded by Harvard University to a person of colour in 1895 for his doctoral thesis titled "The Suppression of the African Slave-Trade to the United States of America, 1638-1870." Jane Addams was an early sociologist and social reformer, but she did not receive a doctorate from Harvard. Harriet Martineau was a British sociologist and writer who was active in the 19th century, before Harvard awarded its first doctorate to a person of colour. Herbert Spencer was an English philosopher and sociologist who was active in the 19th century and did not have any affiliation with Harvard University.

Which Early Sociologist Received the First Doctorate Ever Awarded by Harvard