In the ancient past, residential communities were based on clans within a tribal system, distributed in spots along habitable zones.
Because of the comfortable environment, coupled with their own long sleeping periods and short waking hours, waging war was quite difficult, and the entire civilization lacked truly ambitious figures.
Thus, during the several hundred thousand years of this ancient period, there was never a united community or a formation of a large nation.
This fragmented state was actually quite detrimental to the development of a civilization. Without much exchange, communication, and trade, at most only connected by some "minstrels," the civilization was like stagnant water—how could there be any change?