[Why] After the Great Qing Empire entered the pass it underwent three generations of emperors' brutal governance and internal-affairs rectification, completely pacifying the Three Feudatories and recovering Taiwan. Domestic unified order entered an unprecedented century of stability. [What] Emperors Kangxi, Yongzheng, and Qianlong over three generations ruled with vigor and pushed Spreading the Head Tax into the Land to thoroughly liberate the poll tax. National agricultural output soared, population exploded to four hundred million, and the territory was largely consolidated. [Who] Emperor Yongzheng Yinzhen was a clothes-and-food-toiling, thorough fiscal reform cold and capable emperor, laying the prosperity's material foundation. Emperor Qianlong Hongli was the emperor of grand ambition and showy-merit who pushed prosperity to a luxurious setting sun. [How] This is the supreme apex of classical agricultural civilization's unified order's last twilight prosperity in Huaxia, leaving valuable vast territorial map for modern China. But because of seclusion it also planted the roots of backwardness disaster.
Why
The historic event of High Qing Era represents a key developmental peak of the Huaxia dynastic system. The final peak of classical Chinese socioeconomic prosperity. By establishing this moral or administrative benchmark, it continues to shape the structural and philosophical fabric of ancient Chinese statecraft.