What are the relations between modernity, mobile lifestyles, and urban spaces as we move deeper into what the French sociologist Marc Augé has called the age of supermodernity ? In their wide-ranging contributions to the present collection, geographers, political scientists, historians, economists, and cultural critics take a closer look at mobility in an American context (and beyond). Investigating aspects of American mobility from a decidedly transnational and transatlantic perspective, these essays conjoin in revealing mobility as a crucial constituent of what we call modernity. They also identify the social and ecological consequences of mobility in a rapidly shrinking, globally interconnected and, at the same time, socially and culturally divided world.