In this episode AHR associate editor Konstantin Dierks speaks with historian Paul Kramer whose article "The Geopolitics of Mobility: Immigration Policy and American Global Power in the Long Twentieth Century" appears in the April 2018 issue of the American Historical Review. Kramer is Associate Professor of History at Vanderbilt University and researches the transnational, imperial, and global aspects of modern U.S. history. He is the author of the 2006 book The Blood of Government: Race, Empire, the United States and the Philippines. The article is available online: https://doi.org/10.1093/ahr/123.2.393