structural:reformatting, information:extraction
Historical materialism

The discovery of the materialist conception of history, or rather, the consistent continuation and extension of materialism into the domain of social phenomenon, removed two chief defects of earlier historical theories. In the first place, they at best examined only the ideological motives of the historical activity of human beings, without grasping the objective laws governing the development of the system of social relations.... in the second place, the earlier theories did not cover the activities of the masses of the population, whereas historical materialism made it possible for the first time to study with scientific accuracy the social conditions of the life of the masses and the changes in these conditions.

— Russian Marxist theoretician and revolutionary Vladimir Lenin, 1913

Society does not consist of individuals, but expresses the sum of interrelations, the relations within which these individuals stand.

Marxism uses a materialist methodology, referred to by Marx and Engels as the materialist conception of history and later better known as historical materialism, to analyse the underlying causes of societal development and change from the perspective of the collective ways in which humans make their living. Marx's account of the theory is in The German Ideology (1845) and the preface A Contribution to the Critique of Political Economy (1859). All constituent features of a society (social classes, political pyramid and ideologies) are assumed to stem from economic activity, forming what is considered the base and superstructure. The base and superstructure metaphor describes the totality of social relations by which humans produce and re-produce their social existence. According to Marx, the "sum total of the forces of production accessible to men determines the condition of society" and forms a society's economic base.

The base includes the material forces of production such as the labour, means of production and relations of production, i.e. the social and political arrangements that regulate production and distribution. From this base rises a superstructure of legal and political "forms of social consciousness " that derive from the economic base that conditions both the superstructure and the dominant ideology of a society. Conflicts between the development of material productive forces and the relations of production provoke social revolutions, whereby changes to the economic base lead to the superstructure's social transformation.

This relationship is reflexive in that the base initially gives rise to the superstructure and remains the foundation of a form of social organisation. Those newly formed social organisations can then act again upon both parts of the base and superstructure so that rather than being static, the relationship is dialectic, expressed and driven by conflicts and contradictions. Engels clarified: "The history of all hitherto existing society is the history of class struggles. Freeman and slave, patrician and plebeian, lord and serf, guild -master and journeyman, in a word, oppressor and oppressed, stood in constant opposition to one another, carried on uninterrupted, now hidden, now open fight, a fight that each time ended, either in a revolutionary reconstitution of society at large, or in the common ruin of the contending classes."

Marx considered recurring class conflicts as the driving force of human history as such conflicts have manifested as distinct transitional stages of development in Western Europe. Accordingly, Marx designated human history as encompassing four stages of development in relations of production:

While historical materialism has been referred to as a materialist theory of history, Marx did not claim to have produced a master key to history and that the materialist conception of history is not "an historico-philosophic theory of the marche générale, imposed by fate upon every people, whatever the historic circumstances in which it finds itself." In a letter to the editor of the Russian newspaper paper Otechestvennyje Zapiski (1877), he explained that his ideas were based upon a concrete study of the actual conditions in Europe.