'The resurgence of nationalisms, usually populist, often religious, and all too often authoritarian, is central to global politics today. Soper and Fetzer, already distinguished scholars of religion, immigration, and political identities, have now produced a seminal theory of how and why religion and nationalism are related in distinct ways in different societies. It will have both an immediate and enduring impact.' Rogers M. Smith, Christopher H. Browne Distinguished Professor of Political Science, University of Pennsylvania