As part of its recent "books-21st-century.html">100 Best Books of the 21st Century" project, The New York Times Book Review is interviewing some of the authors whose books appeared on the list. This week, Isabel Wilkerson joins host Gilbert Cruz to discuss "The Warmth of Other Suns," her sweeping history of the movement of Black Americans from the south to points north over the course of the 20th century.

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