Nationalism is one of the great surprises of modern history. How did the nation, a relatively old form of community, rise to such prominence in an era resolutely identified with the individual? Bernard Yack argues that this question is so difficult to answer because of the inadequacy of our understanding of community, and especially the moral psychology that animates it. Yack develops a broader, more flexible theory of community and shows how it can be used to study nations and nationalism. What makes nationalism such a powerful and morally problematic force in our lives is the interplay between old feelings of loyalty to community and relatively new convictions about popular sovereignty. By uncovering this fraught relationship, Yack moves our understanding of nationalism beyond the tired debate between primordialists and modernists, those who exaggerate our loss of individuality and those who underestimate the depth of our attachments to community. A brilliant and gripping book, Nationalism and the Moral Psychology of Community presents a revisionist conception of nationalism that cannot be ignored.