The history of humankind is a history of people movements, with new perceptions of space as a triggering factor for major historical breaks. [1] Migration, defined as ‘the process of people travelling to a new place to live’ [2], has, indeed, always been a common feature of human societies. [3] But, while migrations have significantly enriched European societies in the era of mass movement [4], a shift seems to have occurred in our understanding of national borders.