Hanoi's Road to the Vietnam War opens in 1954 with the signing of the Geneva accords that ended the eight-year-long Franco-Indochinese War and created two Vietnams. In agreeing to the accords, Ho Chi Minh and other leaders of the Democratic Republic of Vietnam anticipated a new period of peace leading to national reunification under their rule; they never imagined that within a decade they would be engaged in an even bigger feud with the United States. Basing his work on new and largely inaccessible Vietnamese materials as well as French, British, Canadian, and American documents,...