Book excerpt: Far from creating a borderless world, contemporary globalization has generated a proliferation of borders. In Border as Method, Sandro Mezzadra and Brett Neilson chart this proliferation, investigating its implications for migratory movements, capitalist transformations, and political life. They explore the atmospheric violence that surrounds borderlands and border struggles across various geographical scales, illustrating their theoretical arguments with illuminating case studies drawn from Europe, Asia, the Pacific, the Americas, and elsewhere. Mezzadra and Neilson approach the border not only as a research object but also as an epistemic framework. Their use of the border as method enables new perspectives on the crisis and transformations of the nation-state, as well as powerful reassessments of political concepts such as citizenship and sovereignty.