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Since ancient times , the Western Region Central Plains and western minority regime and military battleground. Tang Dynasty in the Western Regions , the main enemy of Don Turks, especially the Western Turks , in the process of pacification of the Western Regions , the Tang Dynasty and gradually establish a less edge -based Tri-State counties made ??, four Anxi towns at the core of Western defense systems. Emperor, Empress Wu during the Tubo rise to become the main rival of the Tang Dynasty in the Western Regions in the Western Regions , the two sides repeated contention that the outcome of each . Tang Dynasty, the Western defense system gradually developed around four Anxi towns abandoned . Kaiyuan , Tianbao years , enhanced With Tang Chaoguo force , Tang gradually in the Western Regions and the Tibetan struggle for the upper hand , at this time , the food began to grow , start eastward expansion , with the Tang Dynasty positive conflict . During this period , the Tang Dynasty emerged a large number of outstanding edge , including high Xianzhi closure Chang Qing , Ge Shuhan et al , in the Western expeditions over the years , they set hehe exploits . To Shi Rebellion , Tang occupy absolute dominance in the Western Great food to slow down the pace of enlargement , Tubo also returned to the Qinghai-Tibet Plateau . In this case, the Tang Dynasty, the Western defense system is the most complete . After the outbreak of the Rebellion \More importantly , at the same time , due to the weakness of the Tang Dynasty , the Western Regions of many vassal have backward Tubo , great food and peers , making the Tang Dynasty in the Western defense increasingly passive , Western defense system faces major challenges . Tang Dynasty, the strength and experience accumulated over the years is still played an important role , and still adhere to many years of the Tang Dynasty in the Western Regions . With the increasing decline of the Tang Dynasty , the Tang Dynasty in the Western Regions of the weak position inevitably . The final 792 years of Don in the fall of the last stronghold of the Western West State , the Tang dynasty was eventually driven out of Central Asia, the collapse of the Western defense system in the Tang Dynasty .
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