Each dynasties usually left some contribution for China that would be passed to the next dynasties, making China started to improved when they changed from one dynasty to another
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I believe the answer is: The Zhou dynasty featured decentralized politics but important cultural innovations, while later dynasties emphasized order and centralization
Decentralizaed politics in Zhou dynasty separates chinese territories into several small kingdoms with their own rulers. The later dynasties on the other hand, see these separation as weakness, which is why they transformed the system into a nation controlled by strong centralized government to maintain order among smaller provinces.
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