2. In 206 BC, he led the army into Xianyang, overthrew the regime of the Qin Dynasty, made three rules and abolished the harsh laws of the Qin Dynasty, and won the support of the people.
After more than five years of Chu-Han War, Xiang Yu was defeated, and the country was unified in 202 BC, that is, the emperor became the first person to rise from a commoner to an emperor.