Based on the theoretical reconstruction of neglected post-WWI writings and political action of W. E. B. Du Bois, this volume offers a normative account of transnational cosmopolitanism. Pointing out the limitations of Kant’s cosmopolitanism through a novel contextual account of Perpetual Peace, Transnational Cosmopolitanism shows how these limits remain in neo-Kantian scholarship. Ines Valdez’s framework overcomes these limitations in a methodologically unique way, taking Du Bois’s writings and his coalitional political action both as text that should inform our theorization and normative insights. The cosmopolitanism proposed in this work is an original contribution that questions the contemporary currency of Kant’s canonical approach and enlists overlooked resources to radicalize, democratize, and transnationalize cosmopolitanism.