Assertion: dynasty's empire | /r/HasProperty | founded
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Source sentences:
text: The Chinese empire is founded when the state of Qin unites the other Chinese states in 221 BCE and establishes a centralized system of government; Qin Shi Huangdi (Ch’in Shih Huang-ti), or the First Emperor of Qin, rules for a very short time (221-206 BCE) but lays the foundation for China’s imperial structure and begins construction of the Great Wall for defense to the north.