 Nationalism came into the focus of philosophical debate three decades ago, in the nineties, partly in consequence of rather spectacular and troubling nationalist clashes. Surges of nationalism tend to present a morally ambiguous, and for this reason often fascinating, picture. “National awakening” and struggles for political independence are often both heroic and cruel; the formation of a recognizably national state often responds to deep popular sentiment but sometimes yields inhuman consequences, from violent expulsion and “cleansing” of non-nationals to organized mass murder. The moral debate on nationalism reflects a deep moral tension between solidarity with oppressed national groups on the one hand and repulsion in the face of crimes perpetrated in the name of nationalism on the other. Moreover, the issue of nationalism points to a wider domain of problems related to the treatment of ethnic and cultural differences within democratic polity, arguably among the most pressing problems of contemporary political theory.