India’s formal caste system is well-known – and an argument can be made that it’s time America came to terms with its own rigid hierarchy. Isabel Wilkerson is a winner of the Pulitzer Prize, a National Humanities Medal and a National Book Critics Circle Award for Nonfiction, and she joins host Krys Boyd to talk about the categories Americans are born into that rank us and grade us through no action of our own. Her new book is “Caste: The Origins of Our Discontents.”