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I think centralization of power is due to technology. In ancient rome they could be so centralized and big due to the fact they systematized everything from efficiency. Every legion behaved the same, they had the same tools, the same boots, the same equipment, the same measurement when they built their forts.
Let me quote Jacques Ellul
"The Ellulian concept of technique is briefly defined within the "Notes to Reader" section of The Technological Society (1964). It is "the totality of methods rationally arrived at and having absolute efficiency (for a given stage of development) in every field of human activity."[27] He states here as well that the term technique is not solely machines, technology, or a procedure used to attain an end."
"Ellul set forth seven characteristics of modern technology that make efficiency a necessity: rationality, artificiality, automatism of technical choice, self-augmentation, monism, universalism, and autonomy.[29] The rationality of technique enforces logical and mechanical organization through division of labor, the setting of production standards, etc. And it creates an artificial system which "eliminates or subordinates the natural world."
With global trade, global communications there is just a natural thing to have a global goverment. But alas I got off topic.