Many scholars have recently argued that nation-state—centered approaches in comparative sociology and political science are obsolete. In this view, we have entered, or are about to enter, a new “postnational” or “transnational” era characterized by complex and qualitatively new patterns of multilevel governance, in which the nation-state still plays a role, though a drastically reduced one.1 This decline of the nation-state's sovereignty is said to be accompanied by a growing importance of supranational and transnational actors, institutions, legal norms, and discourses, on the one hand, and increased local autonomy from national constraints, on the other. Given the inherently transnational nature of migration, it is not surprising that this critique of national approaches has been particularly prominent in this field of study.