In modernity, the concept of cosmopolitanism has changed from an intellectual ethos to a vision of an institutionally embedded global political consciousness. The central problem that troubles cosmopolitanism from its moment of inception in 18th-century philosophy to the globalized present is whether we live in a world that is interconnected enough to generate institutions that have a global regulatory reach and a global form of solidarity that can influence their functioning. Examination of Kant's pre-nationalist cosmopolitanism, Marx's postnationalist cosmopolitanism, and decolonizing socialist nationalism indicates the normative attraction of the nation as a mode of solidarity. Contemporary arguments about new cosmopolitanisms focusing on the rise of transnational networks of global cities, postnational social formations created by migrant and diasporic flows and Habermas's recent revival of Kant's project of cosmopolitan democracy have likewise failed to address the persistence of nationalism as a normative force within the field of uneven globalization.