In today’s world, national citizenship determines a person’s ability to migrate across borders. questions that premise. Recognizing the magnitude of deaths occurring at contemporary borders worldwide, the book problematizes the concept of the border and develops arguments for open borders and a world without borders. It explores alternative possibilities, ranging from the practical to the utopian, that link migration with ideas of community, citizenship, and belonging. The author calls into question the conventional political imagination that assumes migration and citizenship to be responsibilities of nation states, rather than cities. While the book draws on the theoretical work of thinkers such as Ernst Bloch, David Harvey, and Henry Lefebvre, it also presents international empirical examples of policies and practices on migration and claims of belonging. In this way, the book equips the reader with the practical and conceptual tools for political action, activist practice, and scholarly engagement to achieve greater justice for people who are on the move.