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Conquest of the Warring States

During the Warring States period preceding the Qin dynasty, the major states vying for dominance were Yan, Zhao, Qi, Chu, Han, Wei and Qin. The rulers of these states styled themselves as kings, rather than using the titles of lower nobility they had previously held. However, none elevated himself to believe that he had the " Mandate of Heaven ", as the Zhou kings had claimed, nor that he had the right to offer sacrifices—they left this to the Zhou rulers.

Before their conquest in the fourth and third centuries BC, the Qin suffered several setbacks. Shang Yang was executed in 338 BC by King Huiwen due to a personal grudge harboured from his youth. There was also internal strife over the Qin succession in 307 BC, which decentralised Qin authority somewhat. Qin was defeated by an alliance of the other states in 295 BC, and shortly after suffered another defeat by the state of Zhao, because the majority of their army was then defending against the Qi. The aggressive statesman Fan Sui (范雎), however, soon came to power as prime minister even as the problem of the succession was resolved, and he began an expansionist policy that had originated in Jin and Qi, which prompted the Qin to attempt to conquer the other states.

The Qin were swift in their assault on the other states. They first attacked the Han, directly east, and took their capital city of Xinzheng in 230 BC. They then struck northward; the state of Zhao surrendered in 228 BC, and the northernmost state of Yan followed, falling in 226 BC. Next, Qin armies launched assaults to the east, and later the south as well; they took the Wei city of Daliang (now called Kaifeng) in 225 BC and forced the Chu to surrender by 223 BC. Lastly, they deposed the Zhou dynasty's remnants in Luoyang and conquered the Qi, taking the city of Linzi in 221 BC.

When the conquests were complete in 221 BC, King Zheng – who had first assumed the throne of the Qin state at age 9 – became the effective ruler of China. The subjugation of the six states was done by King Zheng who had used efficient persuasion and exemplary strategy. He solidified his position as sole ruler with the abdication of his prime minister, Lü Buwei. The states made by the emperor were assigned to officials dedicated to the task rather than place the burden on people from the royal family. He then combined the titles of the earlier Three Sovereigns and Five Emperors into his new name: Shi Huangdi (始 皇帝) or "First Emperor". The newly declared emperor ordered all weapons not in the possession of the Qin to be confiscated and melted down. The resulting metal was sufficient to build twelve large ornamental statues at the Qin's newly declared capital, Xianyang.