Cities are the places where migration-related diversities often become the most manifest. It is where migrants usually arrive, where they make contact with others, where they find housing, jobs and schooling, and from where they sometimes also depart, often to other cities. Migration and diversity are often key parts of the historical development and economic positioning of cities. Many cities were built on migration and continue to be primary magnets for migrants from all over the world. Think about how global cities as London, New York and Shanghai evolved as key cities of migration, or how the economy of port cities as Rotterdam, Marseille, Naples and Cape Town continues to be deeply entwined with migration.