As a Indian, you have a good Chinese history background
Some reson that China can became unified dynasty a long time (Europe can unified by follow these policy)
1.
Watch this video time at: 32:36 As a history teacher, he just get one point : Assimilation
(European National different concept is too strong, why they don't use culture unified concept....)
(If Chinese find America, indians will become Chinese, let them study confucianism, and choose indians peole to control America )
2. Feudal system died before Qin dynasty (221 BC). Feudal system change to lineal primogeniture system-trueborn Eldest Son.
3. Imperial Examination system....If you read confucianism books, poor people also can become officer . Breake the nobleman control.
4. unified everthing, language, ideology....................
5. Absolute monarchy.................................
6. Don’ give military commanders/generals military power start at Song dynasty (Ming and Qing follow this policy).
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I alraly bought the ROTK 30th Anniversary edition game which include ROTK 1 - 12 (support for win7, win8, win8.1) , and I try to play ROTK 1. When I palyed ROTK 1, I even did't know that you just can use keyboard. I'm curious whether all the games can not use the mouse in 1985.