Many states rivaled for power at the end of Zhou dynasty.This is known as the Period of Warring States (475-221 BC). These states came about because the emperors of Zhou annexed territories to relatives and imperial officials for them to govern.The victorious Qin emperor declared himself the First Emperor as he was anticipating many more emperors to come in his dynasty.The Qin Emperor, Zheng, named himself Shi Huangdi (First Emperor), a formulation of titles previously reserved for deities and the mythological sage-emperors. He wanted his successors to rule China forever with the title (Second Emperor), (Third Emperor), etc.
Whether he should be remembered more for his creations or his tyranny is a matter of dispute, but everyone agrees that Qin Shi Huang, the first emperor of the Qin Dynasty, was one of the most important rulers in Chinese history.
Not only was his state strong, his army powerful and his ability as a leader truly exceptional, he also knew how to play one of the other six states off against another and broke the alliance once formed by them.
Historians have blamed some of the other six states for appeasing Qin, but the military power and skillful diplomacy of the latter also contributed to its success.
The Qin Empire has been described as creating a police state with the government holding absolute power. It standardized weights, measures, coinage—the bronze round coin with a square hole in the center—writing and chariot axle widths.
Writing was standardized to permit bureaucrats throughout the land to read documents.