President Abraham Lincoln died 150 years ago, just days after Gen. Robert E. Lee surrendered at Appomattox, ending the Civil War after four years. To discuss the lasting effects of both events, Jeffrey Brown talks to Martha Hodes, author of "Mourning Lincoln," James McPherson, author of "The War That Forged a Nation,” and Isabel Wilkerson, author of “The Warmth of Other
Suns.”