This article offers a reconceptualization of US empire by foregrounding a central concept of its theory and practice: development, an ideology and attendant set of material practices that purport to uplift a defined population through political, economic, and social interventions. Because developmental ideology promises benefits and allocates specific roles to different groups, it has worked as a racializing technology, not only defining and assigning clusters of people to hierarchies of different stages but also establishing possibilities, however limited, for movement between these stages. The article demonstrates how developmental ideas and practices have been persistent, if flexible, features across the racialized government of formerly enslaved persons and Native Americans after the Civil War, overseas expansion to the Philippines at the turn of the nineteenth century, and US participation in transnational debates about empire in the early twentieth century and its pursuit of global hegemony after World War II.