Among the various methodological prescriptions of Anthony Giddens, perhaps the most useful for labor history are his advisories on social change, on the anxieties and tensions attending a society's transition from one geographical scale to another. Labor's experience in the United States offers a case in point. The nation's transformation from a preindustrial to an industrial society entailed, in addition to the inexorables of accelerated urbanization, industrial expansion, and market extension, certain fundamental changes in the conditions of labor. Industrialization restructured the geography of labor markets, revised principles of wage determination, fomented sectarian division in the ranks of labor, and soured the relations between labor and capital. These structural changes led, in turn, to the inevitable responses of, among others, worker combination, protest, industrial violence, and a splintering in the ranks of labor.