Abstract
In the twentieth century pluralism became a common ideology of originally different idealistic philosophical schools, which logically led them to unite in the philosophy of postmodernism. At the end of the twentieth century pluralism become identified with political democracy. In Russia, the doctrine of recognition of equality of many independent ideologies as a basis of democracy has become the most popular in interpretation of K. Jaspers, K. Popper, and P. Feyerabend. The article demonstrates the ideological and methodological inconsistency of pluralism; it shows that only the monism based on the concept of dialectical determinism may reveal objective grounds of democracy. Application of dialectical materialist conception of determinism to the disclosure of system of determinacy of society development reveals the unity of reason and no causal types of determination of this development. Therefore, the objective basis of democracy is not ‘a plurality of factors‘, but subordinated and coordinated system of determinants that define the objective tendency of society to non-State form of government