Celebrated by some as the source of political value and a key organizational principle, decried by others as treacherous and intellectually moribund, the nation- state and nationalism have endured despite the momentous upheavals of the 20th century. But in an age of increasing globalization and political fragmentation, does the nation-state have the relevance it once had? Do the novel challenges and historical developments we face demand that we rethink our understanding of national sovereignty and the principle of self-determination? Do we need to revise our conception of justice and democracy? And how can we, in such circumstances, best manage violent conflict arising from struggles between rival national projects and identities? This thought-provoking volume brings together leading international scholars within political science and theory to explore these questions.