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.
a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.
herodotus taught this. herodotus was an ancient greek historian who was born in halicarnassus in the persian empire. he is known for having written the book the histories, a detailed record of his "inquiry" on the origins of the greco-persian wars.