This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Legalism has a stronger claim than almost any other philosophy in world history to having actually worked, in the narrowest sense: the state that adopted it most thoroughly won. Qin, organized around Shang Yang's rank-by-merit system, mutual-responsibility household groups, and standardized law, administration and weights, turned itself into the most disciplined military and bureaucratic machine among the Warring States, and Han Fei's later synthesis gave that machine an intellectual justification sophisticated enough to be taught rather than merely obeyed. In 221 BCE, Qin finished what a century and a half of Legalist reform had built toward, absorbing the last of the rival states and unifying China for the first time under a single emperor.
The dynasty that Legalism built collapsed in 206 BCE, fifteen years after unification, faster than almost any other founding dynasty in Chinese history. The same mechanisms that had made Qin formidable in war, harsh, uniform punishment applied without regard for circumstance or rank, made it brutal and unpopular in peace, and the same total mobilization of the population for military and construction labor that had won the wars, the Great Wall, the royal tombs, exhausted a population that had spent a generation at war and had no comparable payoff waiting for it once the fighting stopped. Rebellion broke out within a few years of the First Emperor's death, and the dynasty that had out-organized every rival state could not out-organize its own collapse.
What survived was not Legalism's name but its machinery. The Han dynasty that followed Qin publicly repudiated Legalism as a doctrine, adopted Confucianism as its official ideology, and kept, almost entirely intact, the centralized bureaucracy, the standardized law, the household registration and the administrative apparatus Legalist reformers had built. Chinese imperial government for the next two thousand years ran on a mixture historians sometimes call Confucianism in dress and Legalism underneath: a ruling philosophy that spoke the language of virtue and ritual propriety while governing, in practice, through the codified, impersonally applied bureaucratic machinery Shang Yang and Han Fei had designed. Legalism lost the argument about which doctrine deserved credit and won almost everything else.