"The continuity of the cultural field" (10). The axioms of civilizations

3.2.1. Signals of imperial stabilization

An empire is a system of governance reigning over multiple cohesive polities. By cohesive polities I mean societies whose citizens have been bound together for multiple generations through the sharing of a common worldview. Over time such a binding necessarily resulted in the creation of institutions and habits that grew their specific national flavors. 

"The continuity of the cultural field" (9). The axioms of civilizations

3.2. Imperial stabilization

The earth's average temperatures increased abruptly some 12,000 years ago and they stabilized a little less than 9000 years ago. Since then they have varied within a very narrow bandwidth, of + 0.5 °C to - 0.5 °C, which procured humanity a unique climate stability that climatologists have never observed in the earlier climate history of the earth.

"The continuity of the cultural field" (8). The axioms of civilizations

3.1.3. The growth of village population fostered ever more recourse to force

Ultimately free tribesmen did not rush to adopt agriculture. It was not as if this new technology was adopted after having been perceived to offer the paradise on earth. The rise of agriculture was imposed as an answer to an existential threat. Three factors combined that imposed its rise  :