Maxwell's contribution to unification of electricity, magnetism and optics completely changed nineteenth-century physics, and its recategorization set the bases for the twentieth-century physics revolution. Modern social science is a fragmented field, characterized both by a poor integration between the concepts of economics, sociology, anthropology, psychology and history, and for a striking isolation from natural science. This article will explore the importance of incorporating to social science the methodological criteria of Maxwell's own conception in favor of a non-reductionist wide-ranging causal and conceptual integration between social science and natural science.