This conclusion presents some closing thoughts on the concepts covered in the preceding chapters of this book. The book provides a platform that allows us to survey a long history and to compare the findings and debates of scholars in fields that often have little contact with each other. It discusses numerous questions about the links between early modern ghettos and their Nazi counterparts. Michman uncovered one such link in the work of Peter-Heinz Seraphim, an anti-Semitic ideologue of the 1930s. The book suggests that the transnational circulation of the ghetto not only impacted various colonial models, but that colonial models influenced Nazi practices. It explores not only the ways in which policy makers imposed the ghetto on subject populations, but also how the term traveled and was used in turn by scholars and activists seeking to understand or challenge its constraints. The book helps to comprehend processes of ghettoization and spatial segregation across several centuries of time and space.