The confirmation of Judge Brett M. Kavanaugh to the Supreme Court may hinge on a single ruling: Roe v. Wade, the 1973 decision that established a constitutional right to abortion in the United States. In a two-part series, “The Daily” takes a look at the history and legacy of the case. Guest: Sabrina Tavernise, a New York Times correspondent who reported on the story of Roe v. Wade for “The Daily.” For more information on today’s episode, visit nytimes.com/thedaily.