Part three of Oprah’s discussion with Pulitzer Prize-winning writer Isabel Wilkerson and readers of the book, Caste: The Origins of our Discontents. The third episode in the eight-part series focuses on the third pillar of Caste, "Endogamy and the Control of Marriage and Mating." Isabel explores America’s violent history of keeping romantic relationships and family systems within the confines of a given caste as a means of control. We hear questions and an emotional story from a mixed-race couple who faced great adversity when they were married in 1966.