In this keynote address, I discuss how historians can inform current public debates and how these debates in turn shape the research of historians. As a historian of migration, I argue for doing three things in the way we participate in public discussions and how we go about our research. Firstly, we should apply a long-term perspective when contributing to the public and academic discourse. Secondly, by stepping outside of the «container» of the nation, we can follow a transnational approach, and thirdly, we ought to follow an immigrant-centered perspective. In the first empirical case that follows, I delineate the history of the U.S.-Mexico border. The second case provides insight into the public discussion of migration in Switzerland.