The great ancient civilizations flourished around river valleys because the rivers produce rich fertile soil and a supply of water for irrigation of crops and human consumption. This allows for the agricultural production to be greater and it can sustain more people.
What did the Tang Dynasty do that helped conserve the traditional values of Confucianism?
<span>It revived the civil service examination system of the Han.</span>
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So that railroad companies could build railroads, expanding travel across one's country.