There were wars in the Spring and Autumn Period and the Warring States Period, tyranny at the end of Qin Dynasty, plague, famine and war at the end of Han Dynasty, and the national population dropped to an unprecedented low. There were three butchers who entered Jiading in the Qing Dynasty, during the Five Rebellions in China, the tyranny in the late Sui Dynasty, the separatist regime in the late Tang Dynasty, Tuchuan in the late Ming Dynasty and the early Qing Dynasty, and the three butchers in Jiading in the Qing Dynasty ... I believe you must know what happened after the Opium War, so I won't say much.