Book excerpt: At Canaan’s Edge: America in the King Years, 1965-68 is the final volume in Taylor Branch's magnificent history of America in the years of the Civil Rights Movement and Vietnam War, recognized universally as the definitive account and ultimate recognition of Martin Luther King's heroic place in the nation's history. The final volume of Taylor Branch's monumental, much honored, and definitive history of the Civil Rights Movement (America in the King Years), At Canaan's Edge covers the final years of King's struggle to hold his non-violent movement together in the face of factionalism within the Movement, hostility and harassment of the Johnson Administration, the country torn apart by Vietnam, and his own attempt (and failure) to take the Freedom Movement north. At Canaan's Edge traces a seminal era in our defining national story, freedom. The narrative resumes in Selma, crucible of the voting rights struggle for black people across the South. The time is early 1965, when the modern Civil Rights Movement enters its second decade since the Supreme Court's Brown decision declared segregation by race a violation of the Constitution. From Selma, King's non-violent Movement is under threat from competing forces inside and outside. Branch chronicles the dramatic voting rights drives in Mississippi and Alabama, Meredith's murder, the challenge to King from the Johnson Administration and the FBI and other enemies. When King tries to bring his Movement north (to Chicago), he falters. Finally we reach Memphis, the garbage strike, King's assassination. Branch's magnificent trilogy makes clear why the Civil Rights Movement, and indeed King's leadership, are among the nation's enduring achievements.