Forebodings

At Canaan’s Edge: America in the King Years, 1965-68, by Taylor Branch (Simon & Schuster, 1,056 pp., $35)

FORMALLY, At Canaan’s Edge is the third and final entry in Taylor Branch’s magisterial chronicle of the civil-rights movement, covering 1965 to 1968. The book is especially valuable, however, in explaining later events-in showing how we got from “I Have a Dream” to “Kill Whitey.”