In 1858, Cyprian Clamorgan wrote a brief but immensely readable book entitled The Colored Aristocracy of St. Louis. The grandson of a white voyageur and a mulatto woman, he was himself a member of the "colored aristocracy." In a setting where the vast majority of African Americans were slaves, and where those who were free generally lived in abject poverty, Clamorgan's "aristocrats" were exceptional people. Wealthy, educated, and...