Free occupation of the land plots, proportional to the increase of the population really does end once with all the ensuing consequences, but this fact is difficult to consider as primary and determining in the development of communities, since it does not indicate the reason of the population growth and, therefore, it is an external factor, and not primary.

D.E. Durkheim considered the social differentiation of labor as the main driving force of the development of society, because he believed that, unlike simple communities, where people are connected by personal relationships, interests and traditions, people in modern large communities increasingly rely on each other due to differences in their own specialization. At the same time, Durkheim considered the growth of population and population density to be key factors in the development of society [3, p. 106; 4, p. 125].

Certainly, a sufficient number and density of the population favor to emergence of various crafts, and then – to the differentiation of labor to facilitate and improve its productivity. All this, naturally, can be carried to the favorable conditions promoting emergence and fixing of the property rights, and accordingly – towards the development of trade, cities, states and much more, but all these factors are only the outer framing of the process of the development of human and its communities. Therefore, the question remains of what after all drives people to move forward in case, if the favorable conditions arise.

K. Marx tried to prove that the driving force of social development is the contradiction between needs of people and opportunities of their satisfaction which is being allowed in the struggle of the productive forces of society and the tools of labor, as well as – in the struggle of owners of the manufacture, against a class of employees on this manufacture [5].

Here, too, remains without determining the source of the emergence of the people's growing needs, forcing them not content with the necessary, but to seize for themselves, taking away from others, everything possible, including what they are not able to exhaust or use during life. Therefore, this factor cannot but proceed from some hidden, internal source, i.e. it is the secondary.

The engine of history is the struggle for existence. Such is, in particular, opinion of the representative of school of social Darwinism Ludwig Gumplowicz. He believes that conflicts in society are ineradicable, because people mercilessly are fighting for influence, the survival and dominance. Gumplowicz argues that any society develops in accordance with the law, consisting in "… the desire of each social group to subordinate to itself every other social group encountered in its path, in the aspiration for enslavement, domination" [6, p. 159].

However, similar ruthless struggle for survival and existence is characteristic fullest not for the person, and flora and fauna whereas for the person this struggle coexists, for example, with altruism, mercy, self-respect, and these human features not always suffer defeat in the course of the struggle of the person for existence: the person in the realities of life, unlike animals, knows about own mortality, but in many cases this knowledge ignores, that in many respects influences progress in development of communities, especially in moral aspect. In other words, unlike the rest living beings who fight for survival among themselves the person first of all struggles with himself within himself, and only individuals with overwhelming domination of the lowest consciousness fall practically to an animal state.

Thus, in fact, all the above considerations of various scientists who adhere to the materialistic position, about the driving forces of social development cannot be adequate: they are external factors or conditions that can only accelerate or slow down the process of development of these or those communities of civilization, but it is impossible to name each of them or even all these factors together, as the sources, causes or primary driving forces of the development of society.

Indeed, these phenomena and conditions to a greater or lesser extent have existed under the primitive communal system, when tens of thousands of years there was no visible development. Means, their action depends on certain hidden processes, on accumulation in human communities of some "substance". The main thing from these hidden processes is the functioning of the new – already human consciousness, outside of which the person would have remained as a primate, and this activity begins to become complicated, accelerate and be shown with bigger efficiency with growth of self-consciousness of the person, which is absent about other living beings, and this growth attracts due to the creativity more and more various information streams to the person and his communities.

The idealistic approach to the problem of the development of society as and a materialistic one, exposes a number of different factors, but mostly of an intangible character, which, in opinion of their authors, are the driving forces of social development.

Aurelius Augustinus Hipponensis attributes the driving force of social development to the rooting in man of a consciously manifested the thrust towards God: "So this heavenly hail, while he is in earthly wandering, calls on citizens from all nations and recruits a itinerant society in all languages, without regard for the fact that there are various in rights, laws and institutions by which the world of the earth is established or maintained; nothing of the latter. not abolishing or destroying, but, on the contrary, saving everything, that, although is different for other peoples, but is directed to the same goal of the earthly world, unless it hinders the religion that teaches to honoring of one supreme and true God "[7. About a God's hail. XIX, 17].

The thrust to God means first of all the aspiration of the person to get closer to perfection, but, as we know, good intentions can lead away in the opposite direction up to such limit where opportunities for development disappear completely. Almost all religious sects and such large confession as Muslim are an example of it.

Pitirim Sorokin believes the accumulation of base of scientific knowledge is the main source of development, as a result of which the contradictory variety of real-life sociocultural systems will be transformed to a certain integrated sociocultural layer [8].