Qin Shihuangdi was a powerful leader that created the Qin Dynasty and the Great Wall of China.

Qin Dynasty:
Qin was a powerful leader that easily defeated its chief rivals. He was also the first emperor of the Qin Dynasty. In 221 B.C. he declared the creation of a new dynasty. This dynasty made lots on changes in the country, like legalism was adopted as the regime's official ideology, and the central bureaucracy was divided into three parts: the civil division, the military division, and the censorate. But Qin did make something important that will change China in good and bad way. He created the Great Wall of China. He also built road systems for easier trade.

During the Qin dynasty they were trying to make a more centralized government.