Abstract
This article examines racial theories of development in connection with Kant; America exceptionalism, nationalism, and nativism; and the transformation of manifest destiny into a racial destiny. It then focuses on the forms of social Darwinist thinking that pervaded and dominated American intellectual life toward the end of the nineteenth century, as well as the chief ideological uses to which this new racial imaginary was put in domestic and foreign affairs. Finally, it sketches the decline of this dominant ideology and its replacement with a nearly equivalent cultural theory of development and difference