Many international law scholars have begun to argue that the modern world is experiencing a “decline of citizenship,” and that citizenship is no longer an important normative category. On the contrary, this paper argues that citizenship remains an important category and, consequently, one that implicates considerations of justice. I articulate and defend a “civic” notion of citizenship, one based explicitly on political values rather than shared demographic features like nationality, race, or culture. I use this premise to argue that a just citizenship policy requires some form of both the jus soli (citizenship based on location of birth) and the jus sanguinis (citizenship based on “blood” or descent) approaches to citizenship acquisition. ...