The Qin Dynasty came to an end with the death of the First Qin Emperor, Qin Shi Huang in 210 BC. The emperor's advisors will start an internal dispute within the dynasty for the control of power. This led to the death of both of the advisors and the second Qin emperor Qin Er Shi.
This scenario paved the way for the Chu General, Xiang Yu, to be proclaimed king of Western Chu, and Liu Bang, who would later found the Han Dynasty.