How did the Shang Dynasty took over Xia Dynasty?

During late Xia, the last emperor, Jie, was a tyrant and the court was corrupted. People were disappointed. In this circumstance, Tang, the leader or Shang trible, one of the vassal state of Xia, rose up to overthrew Xia to found Shang.

The achievements of Shang: the earlies charcters of China - Oracle Scripts; the skills of making bronze wares improving a lot; agriculture, and husbandry industry progressing much

Xia: the repreentative is that the Abdication System for emperor was changed to hereditary system in the feudal society.

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