Throughout the entire Cold War era, Vietnam served as a grim symbol of the ideological polarity that permeated international politics. But when the Cold War ended in 1989, Vietnam faced the difficult task of adjusting to a new world without the benefactors it had come to rely on. In Changing Worlds, David W. P. Elliott, who has spent the past half century studying modern Vietnam, chronicles the evolution of the Vietnamese state from the end of the...