Why was china not controlled by dynastic rulers for a period during the third century before the common era

From at least 1766BCE to the twentieth century of the Common Era, China was ruled by dynasties. A dynasty is a family that passes control from one generation to the next. A dynasty does not have to last for a long
time. One Chinese
dynasty lasted

more than 800

years while

another lasted
only fifteen years.

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question- above

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answer; ethnocentric;