The creation of the Soviet Union was presented as the most important turning event in human history, based on the Marxist theory of historical materialism. This theory identified means of production as chief determinants of the historical process. They led to the creation of social classes, and class struggle was the 'motor' of history. The sociocultural evolution of societies had to progress inevitably from slavery, through feudalism and capitalism to communism. Furthermore, the Communist Party of the Soviet Union became the protagonist of history, as a "vanguard of the working class", according to development of this theory by Vladimir Lenin. Hence the unlimited powers of the Communist Party leaders were claimed to be as infallible and inevitable as the history itself. It also followed that a worldwide victory of communist countries is inevitable.