“Every range of a Turkoman tribe formerly bordered upon a wide belt which might be designated as its ‘looting district.’ Everything north and east of Chorassan, though nominally under Persian dominion, has for decades belonged more to the Turkomans, Jomudes, Goklenes, and other tribes of the bordering plains, than to the Persians. The Tekinzes, in a similar manner, looted all the stretches from Kiwa to Bokhara, until other Turkoman tribes were successfully rounded up either by force or by corruption to act as a buffer. Numberless further instances can be found in the history of the chain of oases which extends between Eastern and Western Asia directly through the steppes of its central part, where since ancient times the Chinese have exercised a predominant influence through their possession of all important strategic centers, such as the Oasis of Chami. The nomads, breaking through from north and south, constantly tried to land on these islands of fertile ground, which to them must have appeared like Islands of the Blessed. And every horde, whether laden down with booty or fleeing after defeat, was protected by the plains. Although the most immediate threats were averted by the continued weakening of the Mongols, and the actual dominion of Thibet, yet the last insurrection of the Dunganes showed how easily the waves of a mobile tribe break over these islands of civilization. Only after the destruction of the nomads, impossible as long as there are open plains in Central Asia, can their existence be definitely secured.”[27] The entire history of the old world is replete with well-known instances of mass expeditions, which must be assigned to the first stage of state development, inasmuch as they were intent, not upon conquest, but directly on looting. Western Europe suffered through these expeditions at the hands of the Celts, Germans, Huns, Avars, Arabs, Magyars, Tartars, Mongolians and Turks by land; while the Vikings and the Saracens harassed it on the waterways. These hordes inundated entire continents far beyond the limits of their accustomed looting ground. They disappeared, returned, were absorbed, and left behind them only wasted lands. In many cases, however, they advanced in some part of the inundated district directly to the sixth and last stage of state formation, in cases namely, where they established a permanent dominion over the peasant population. Ratzel describes these mass migrations excellently in the following: