Lately everyone has been talking about race, but Pulitzer Prize-winner Isabel Wilkerson wants us to look at caste as well. We may associate that strict social hierarchy with India, but Wilkerson argues it has been present in the U.S. for over 400 years. She talks with Don about her new book, Caste: The Origins of Our Discontents, and why she thinks race is just one part of a larger system that determines who is valued and who is dispensable in American society.
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