What happens to a sense of belonging when national and regional governments, religious organizations, community groups, political parties, and corporations become unstable and incoherent, as they have in these nationalist and postnationalist times? From a richly interdisciplinary perspective, the authors examine notions of citizenship and cultural hybridization, migration and other forms of mobility, displacements and ethnic cleansing, and the nature of national belonging in a world turning ever more fluid, aided by transnational flows of capital, information, people, and ideas.