1 Introduction: The Political Sources of Solidarity in Diverse SocietiesSection 1 The Political Theory of Solidarity2 Solidarity and its Sources3 Citizenship and Collective Identities as Political Sources of Solidarity in the European Union4 Against Fraternity Democracy without SolidaritySection 2 Public Attitudes on Diversity and Solidarity5 Tension Between the Elites and the Masses in Germany6 Diversity and Solidarity New Evidence from Canada and the US7 Conceptions of Citizenship and Tolerance Towards Immigrants A Comparative Study of Public Opinion DataSection 3 The Politics of Diversity and Solidarity8 The Political Sources of Social Solidarity9 The Electoral Politics of Solidarity The Welfare Agendas of Radical Right Parties10 Making Xenophobia Matter The Consequences of the 2002 Elections for Immigration Politics in the Netherlands11 Solidarity, Diversity, and the Quality of Government12 Solidarity and Conflict Understanding the Causes and Consequences of Access to Citizenship, Civic Integration Policies, and Multiculturalism13 Diversity and Solidarity in Denmark and Sweden14 Belgium A Hard Case for Liberal Nationalism?Section 4 Concluding Commentary15 Concluding Reflections Solidarity, Diversity, and Social Justice