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Conquest of Qi

In 221 BC, Qin conquered Qi, the final unconquered state. It had not previously contributed or helped other states when Qin was conquering them. As soon as Qin's intention to invade it became clear, Qi swiftly surrendered all its cities, completing the unification of China and ushering in the Qin dynasty. The last Qi king lived out his days in exile in Gong and was not given a posthumous name after death, therefore he is known to posterity by his personal name Jian.

The Qin king Ying Zheng declared himself as Qin Shi Huangdi, "The first Sovereign Emperor of Qin".

In the rule of the Qin state, the union was based solely on military power. The feudal holdings were abolished, and noble families were forced to live in the capital city Xianyang, in order to be supervised. A national road as well as greater use of canals was used in order for deployment and supply of the army to be done with ease and speed. The peasants were given a wider range of rights in regards of land, although they were subject to taxation, creating a large amount of revenue to the state.