2. The Anshi Rebellion was the turning point of the Tang Dynasty from prosperity to decline. In this social unrest, Li Tang's rule was almost destroyed. In order to quell the unrest, the Tang government mobilized almost all its troops and spent most of its national strength. After this rebellion, the national strength of the Tang Dynasty never recovered to its peak. In order to quell the rebellion, the Tang Dynasty set up too many posts of our troops, which led to the situation of local support for the separatist regime in the later period. This situation was not effectively controlled by several emperors in the Tang Dynasty, and even in the confrontation with the forces of the buffer region, the Tang government was repeatedly in a weak position. The central power was exhausted, the influence of the buffer region became more and more powerful, and the regime of the Tang Dynasty became increasingly decadent. From the late Tang Xuanzong, eunuchs began to play an important role in controlling the political situation. From Xuanzong to Dezong, eunuchs gradually mastered the military power, exploited the rights of officials, colluded with the forces of the buffer regions, and went beyond the law. Except these eunuchs. There are also factions among the major families. In order to compete, the factions do not distinguish between right and wrong and do not stress principles, which makes the political situation chaotic.
3. Naturally, the biggest victims of political instability are the people. At the end of the Tang dynasty, peasant uprisings broke out in various places, and finally the Tang dynasty collapsed under these reasons.