Prelude to the Han
From 403 bce onward seven kingdoms other than Zhou constituted the ruling authorities in different parts of China, each of which was led by its own king or duke. In theory, the king of Zhou, whose territory was by now greatly reduced, was recognized as possessing superior powers and moral overlordship over the other kingdoms, but practical administration lay in the hands of the seven kings and their professional advisers or in the hands of well-established families. Then in 221 bce, after a long process of expansion and takeover, a radical change occurred in Chinese politics: the kingdom of Qin succeeded in eliminating the power of its six rivals and established a single rule that was acknowledged in their territories. According to later Chinese historians, this success was achieved and the Qin empire was thereafter maintained by oppressive methods and the rigorous enforcement of a harsh penal code, but this view was probably coloured by later political prejudices. Whatever the quality of Qin imperial government, the regime scarcely survived the death of the first emperor in 210 bce. The choice of his successor was subject to manipulation by statesmen, and local rebellions soon developed into large-scale warfare. Gaozu, whose family had not thus far figured in Chinese history, emerged as the victor of two principal contestants for power. Anxious to avoid the reputation of having replaced one oppressive regime by another, he and his advisers endeavoured to display their own empire—of Han—as a regime whose political principles were in keeping with a Chinese tradition of liberal and beneficent administration. As yet, however, the concept of a single centralized government that could command universal obedience was still subject to trial. In order to exercise and perpetuate its authority, therefore, Gaozu’s government perforce adopted the organs of government, and possibly many of the methods, of its discredited predecessor.
The authority of the Han emperors had been won in the first instance by force of arms, and both Gaozu and his successors relied on the loyal cooperation of military leaders and on officials who organized the work of civil government. In theory and to a large extent in practice, the emperor remained the single source from whom all powers of government were delegated. It was the Han emperors who appointed men to the senior offices of the central government and in whose name the governors of the commanderies (provinces) collected taxes, recruited men for the labour corps and army, and dispensed justice. And it was the Han emperors who invested some of their kinsmen with powers to rule as kings over certain territories or divested them of such powers in order to consolidate the strength of the central government.