Facing a divided nation reeling from insurrection and impeachment, how do President Joe Biden and Vice President Kamala Harris move forward in a country still fighting a raging pandemic? Hosted by Norah O'Donnell and featuring reports by Gayle King, Erin Moriarty and Peter Van Sant, "One Nation: Indivisible" reveals the personal side of the history-making ticket and looks ahead to a country facing several inflection points.