XXXIV. Between Rome and China
THE SECOND and first centuries B.C. mark a new phase in the history of mankind. Mesopotamia and the eastern Mediterranean are no longer the centre of interest. Both Mesopotamia and Egypt were still fertile, populous and fairly prosperous, but they were no longer the dominant regions of the world. Power had drifted to the west and to the east. Two great empires now dominated the world, this new Roman Empire and the renascent Empire of China. Rome extended its power to the Euphrates, but it was never able to get beyond that boundary. It was too remote. Beyond the Euphrates the former Persian and Indian dominions of the Seleucids fell under a number of new masters. China, now under the Han dynasty, which had replaced the Ts'in dynasty at the death of Shi-Hwang-ti, had extended its power across Tibet and over the high mountain passes of the Pamirs into western Turkestan. But there, too, it reached its extremes. Beyond was too far.
China at this time was the greatest, best organized and most civilized political system in the world. It was superior in area and population to the Roman Empire at its zenith. It was possible then for these two vast systems to flourish in the same world at the same time in almost complete ignorance of each other. The means of communication both by sea and land was not yet sufficiently developed and organized for them to come to a direct clash.
Yet they reacted upon each other in a very remarkable way, and their influence upon the fate of the regions that lay between them, upon central Asia and India, was profound. A certain amount of trade trickled through, by camel caravans across Persia, for example, and by coasting ships by way of India and the Red Sea. In 66 B.C. Roman troops under Propey followed in the footsteps of Alexander the Great, and marched up the eastern shores of the Caspian Sea. In 102 A.D. a Chinese expeditionary force under Pan Chau reached the Caspian, and sent emissaries to report upon the power of Rome. But many centuries were still to pass before definite knowledge and direct intercourse were to link the great parallel worlds of Europe and Eastern Asia.
To the north of both these great empires were barbaric wildernesses. What is now Germany was largely forest lands; the forests extended far into Russia and made a home for the gigantic aurochs, a bull of almost elephantine size. Then to the north of the great mountain masses of Asia stretched a band of deserts, steppes and then forests and frozen lands. In the eastward lap of the elevated part of Asia was the great triangle of Manchuria. Large parts of these regions, stretching between South Russia and Turkestan into Manchuria, were and are regions of exceptional climatic insecurity. Their rainfall has varied greatly in the course of a few centuries. They are lands treacherous to man. For years they will carry pasture and sustain cultivation, and then will come an age of decline in humidity and a cycle of killing droughts.
The western part of this barbaric north from the German forests to South Russia and Turkestan and from Gothland to the Alps was the region of origin of the Nordic peoples and of the Aryan speech. The eastern steppes and deserts of Mongolia was the region of origin of the Hunnish or Mongolian or Tartar or Turkish peoples-for all these several peoples were akin in language, race, and way of life. And as the Nordic peoples seem to have been continually overflowing their own borders and pressing south upon the developing civilizations of Mesopotamia and the Mediterranean coast, so the Hunnish tribes sent their surplus as wanderers, raiders and conquerors into the settled regions of China. Periods of plenty in the north would mean an increase in population there; a shortage of grass, a spell of cattle disease, would drive the hungry warlike tribesmen south.
For a time there were simultaneously two fairly effective Empires in the world capable of holding back the barbarians and even forcing forward the frontiers of the imperial peace. The thrust of the Han empire from north China into Mongolia was strong and continuous. The Chinese population welled up over the barrier of the Great Wall. Behind the imperial frontier guards came the Chinese farmer with horse and plough, ploughing up the grass lands and enclosing the winter pasture. The Hunnish peoples raided and murdered the settlers, but the Chinese punitive expeditions were too much for them. The nomads were faced with the choice of settling down to the plough and becoming Chinese tax-payers or shifting in search of fresh summer pastures. Some took the former course and were absorbed. Some drifted north-eastward and eastward over the mountain passes down into western Turkestan.
This westward drive of the Mongolian horsemen was going on from 200 B.C. onward. It was producing a westward pressure upon the Aryan tribes, and these again were pressing upon the Roman frontiers ready to break through directly there was any weakness apparent. The Parthians, who were apparently a Scythian people with some Mongolian admixture, came down to the Euphrates by the first century B.C. They fought against Pompey the Great in his eastern raid. They defeated and killed Crassus. They replaced the Seleucid monarchy in Persia by a dynasty of Parthian kings, the Arsacid dynasty.