At the time of the Manchu conquest (about 1644) the Chinese developed a passionate hatred for the invaders from the northeast. In entrenching themselves the Manchus committed a fateful blunder which was to bring momentary strength but ultimate ruin: they enforced racial segregation in the political, social, and economic sphere. Legend has it that a Chinese statesman, forced into Manchu service, suggested this plan and thus laid the cornerstone for the eventual Chinese liberation. The Manchus prohibited miscegenation; they established Manchu garrisons throughout the Empire, keeping their troops from work (which might have led to intermingling with the Chinese) and thus ruining them by sloth. A fixed quota of Manchus was introduced into the government service, irrespective of the operation of the examination system. In time the Chinese scholars submitted willingly enough to the alien rule; two of the Manchu emperors were the most enlightened patrons which Chinese letters and arts had had in centuries, and the intellectual opposition dwindled away to a minimum. Among the populace there was no such general reconciliation. Deprived for the first time of scholarly leadership, the common people, peasants and artisans, organized numerous secret societies. The societies flourished, coming to supersede the government in whole areas and marking many decades with insurrection and riot. Scholars fought the secret societies because of their uncouth rituals, their heterodoxy of ideas, their opposition to the existing system. The societies answered by building up political agencies which were able to act on the lower and more generally understood levels of ideology. These groups kept patriotism afire. The greatest of their uprisings, the T'ai-p'ing rebellion of 1849-1865, was put down with the assistance of the Western Christian states, but it left a permanent mark on Chinese society. The rebels had shown that it was possible to wrest the greater part of China from Manchu rule. They were the first to welcome the invasion of Christianity, adopting a fantastically modified Christian faith. They awakened the Chinese to the immediate possibility of a war of liberation against the outsiders who held the throne of the Chinese world. The T'ai-p'ing rebellion showed its strength as a patriotic movement. It was successful in shaking the established ideology with a rival compounded of the more vulgar parts of the old, combined with Christianity. And it indicated the weakest point of the dynasty--governmental inadequacy in dealing with the agrarian problem. The years of formal stability gave China a much increased population; the same years were years of political decline which raised the cost of government. A house-cleaning was in order. The T'ai-p'ing demonstrated the need for it; the Manchu dynasty refused to yield to the demand.