its relation to the Han empire.
Incorporation of South China_

In the time of the Ch'in dynasty there had already come into unpleasant
prominence north of the Chinese frontier the tribal union, then
relatively small, of the Hsiung-nu. Since then, the Hsiung-nu empire had
destroyed the federation of the Yueeh-chih tribes (some of which seem to
have been of Indo-European language stock) and incorporated their people
into their own federation; they had conquered also the less well
organized eastern pastoral tribes, the Tung-hu and thus had become a
formidable power. Everything goes to show that it had close relations
with the territories of northern China. Many Chinese seem to have
migrated to the Hsiung-nu empire, where they were welcome as artisans
and probably also as farmers; but above all they were needed for the
staffing of a new state administration. The scriveners in the newly
introduced state secretariat were Chinese and wrote Chinese, for at that
time the Hsiung-nu apparently had no written language. There were
Chinese serving as administrators and court officials, and even as
instructors in the army administration, teaching the art of warfare
against non-nomads. But what was the purpose of all this? Mao Tun, the
second ruler of the Hsiung-nu, and his first successors undoubtedly
intended ultimately to conquer China, exactly as many other northern
peoples after them planned to do, and a few of them did. The main
purpose of this was always to bring large numbers of peasants under the
rule of the nomad rulers and so to solve, once for all, the problem of
the provision of additional winter food. Everything that was needed, and
everything that seemed to be worth trying to get as they grew more
civilized, would thus be obtained better and more regularly than by
raids or by tedious commercial negotiations. But if China was to be
conquered and ruled there must exist a state organization of equal
authority to hers; the Hsiung-nu ruler must himself come forward as Son
of Heaven and develop a court ceremonial similar to that of a Chinese
emperor. Thus the basis of the organization of the Hsiung-nu state lay
in its rivalry with the neighbouring China; but the details naturally
corresponded to the special nature of the Hsiung-nu social system. The
young Hsiung-nu feudal state differed from the ancient Chinese feudal
state not only in depending on a nomad economy with only supplementary
agriculture, but also in possessing, in