Simple answer irrigation system.
Want more information use this source:
https://en.m.wikipedia.org/wiki/Neolithic_Revolution
Karl Marx should be the correct answer. Hope this helps! :)
Shih Huang Ti in order to control ideas he commanded his people to burn all existing books. Shih Huang-ti set up a concentrated organization and built a system of streets and trenches. He battled against the steppe people groups from the northern leave, and he started that huge work, the Great Wall of China, as far as possible to their attacks.
