"The mode of production of material life conditions the general process of social, political, and intellectual life. It is not the consciousness of men that determines their existence, but their social existence that determines their consciousness."
Works such as: The Condition of the Working Class in England (1844-45), The Peasant War in Germany (1850). And perhaps one of his most important works,The Origin of the Family, Private Property, and the State ( 1884)
Engels even believed that Marx could rival Darwin, claiming that, "Just as Darwin discovered the law of development of organic nature, so Marx discovered the law of development of human history."
By the 1970's and 1980's Other areas were being adopted into marxist view, such as, Womens History, Anthropology (gender history) ,other feminist historical work, and cultural histories.