To mark Juneteenth today, a look at the history of the holiday, and what it means for America's story to have two federally recognized Independence Days. On today's show, Annette Gordon-Reed, Harvard University professor and the author of The Hemingses of Monticello: An American Family and On Juneteenth (Liveright, 2021), talks about the history of Juneteenth and how it's evolved since becoming a federal holiday.