Racists and xenophobes have always condemned cosmopolitanism. They pit the cosmopolitan against the national. But that is a mistake. Cosmopolitanism blends well with the ideals of republican sovereignty and the egalitarian vision implied by socialist sovereignty as well. New policies and ideals are required to deal with issues that transcend the nation-state such as immigration, cyber-conflicts, environmental devastation, pandemics, transnational anti-democratic movements, resurgent absolutist religious beliefs, and attacks on pluralism. A cosmopolitan sensibility is necessary to deal with such matters and what “the world” means today. Whether or not sovereignty can take cosmopolitan form to meet the new challenges of global society will determine the future of world politics.