Cosmopolitanism is a perspective, made possible by the practical interest of reason, from which human moral agents understand themselves as empowered to render morally intelligible the range of human interaction that takes place within the socio-cultural matrix constituting the dynamics of history. I argue that “a cosmopolitan perspective” provides the basis upon which Kant sees it possible for human moral agents to work in concert with one another to counter the distinctive social form of moral obduracy at work in the dynamic of unsocial sociability. Cosmopolitanism thus serves as “a social anthropology of hope”: a framework from which agents may understand that the moral character of their human interaction is indexed to the concrete social hope that Kant articulates as distinctive to human finite rationality: The hope that human beings work together to fashion a world order for enduring peace.