The Qin dynasty (22 1 ~ 207) lasted 15 years. In 22 1 year BC, Ying Zheng, king of Qin, unified the six countries, ended the long-term vassal regime, and established the Qin Dynasty, which was called "Qin Shihuang" in history. The Qin Dynasty became the first centralized country in the history of China. In 209 BC, Chen Sheng and Guangwu cut firewood for soldiers, rose up, and the world responded. Liu Bang and Xiang Yu rose up against Qin. In 207 BC, the Qin Dynasty fell.