What measures did Emperor Taizong take? What are the reasons for the great development of ethnic relations in the Tang Dynasty?

In foreign policy, Li Shimin also made a fatal mistake. Because of the expansion and military victory in Zhenguan period, they were all based on the collapse of civil strife in East and West Turkistan. Although Tang Jun seized the opportunity, took advantage of others' crisis, made the tribes bow to their knees and claimed to be vassals, the victory was quite opportunistic. Datang's military strength is not enough to defeat the other side before the civil strife, and it is even very unwilling to maintain its own rule. Although this system is loosely controlled, it can only adopt the "Giffordshire system".

There are essential differences between Jimizhou and the mainland, so the Tang Dynasty will not be honest with the people in Jimizhou, let alone immigrate to the border to fully communicate with them and truly assimilate this place. On the contrary, it will be arrogant as a ruler, causing widespread resentment among people in Jimmy State. On the one hand, they consciously or unconsciously promoted the economic, cultural, industrial and commercial development of these tribes. A smart government treats the conquered territory, or it constantly provokes division, making it difficult for people to sit up; It is really stupid to really integrate and accept it as a nation, which, like the Tang Dynasty, has its grievances and contributes to its development. It is equivalent to treating food as an enemy and finally creating one enemy after another for yourself. By the middle and late period of Emperor Gaozong's rule, the evil consequences laid by Li Shimin in the past had already broken out. The surrounding tribes that had been supported before were growing, while the Tang Empire was declining. As a result, the relationship between the Tang Empire and Zhou Fan was reversed, and they were attacked by each other one after another, so the border of the Tang Dynasty was no longer peaceful. To make matters worse, the previous uncontrolled expansion led to a long and defenceless border and a crisis in border defense. ...

Under the influence of internal troubles and foreign invasion, the Tang Empire was defeated in three directions: north, west and east, and hundreds of thousands of troops were wiped out. Prior to this, most of the land seized by civil strife in neighboring countries was spit out, and the situation went from bad to worse. Since the middle of Emperor Gaozong's reign, the Tang Dynasty has inevitably embarked on the road of decline. Because this disintegration is caused by the essential factor of the means of production (land merger), it is irreparable. The Tang Dynasty was destroyed by Emperor Taizong. And only care about the immediate Emperor Taizong, who paid attention to it before his death, but made poor Li Zhi helpless about the mess he left behind, and finally ended up with a mediocre and incompetent historical evaluation.

By the time Li Longji ascended the throne, the Tang Empire had just lost its territory after decades of fiasco, and it was already in jeopardy. After Tang Xuanzong took over such a mess, he was simply unable to cope with the crisis. In fact, at this time, the defeat of the Tang Dynasty has become a reality, and no one in power can turn the tide. In desperation, Li Longji had to temporarily take care of his eyes, and was forced to quench his thirst with poison, reform the military system, and let the buffer region sit up. Sure enough, the fighting capacity of the Datang border guards has been significantly improved, and the trend of losing ground on the border has been stopped. At one time, it was countered in the Western Regions, and at one time, the whole country was greatly boosted. The effect of quenching thirst by drinking poison is extremely obvious. In the early days of Tianbao, the Tang Empire seemed to be full of youth, with strong border troops and prosperous economy, which was the highest in the Tang Dynasty in 300 years and once presented the image of ZTE. However, this is just a sign of a dead end, which is doomed to be unsustainable. As far as Tang Jun, the healthiest western region in Tianbao period, was concerned, as early as a few years before the Anshi Rebellion, the Tang Dynasty had already been defeated in the decisive battle of patrolling Luo, and the most elite Anxi Tang Jun was completely annihilated and almost completely expelled from the western regions. This incident fully shows that even though the Tang Dynasty was desperate to inspire all the forces, it was still hard to support in the face of such slightly stronger opponents as Dashi and Tubo. It can be seen that the national strength and military strength of the Tang Dynasty are by no means as powerful as some people think, and the world is invincible, just like Tubo, and far from the Arab Empire.

During the Tianbao period, the Tang Dynasty, known as the most prosperous military power, suffered repeated defeats in the four-sided war (Nanzhao, Dashi and Qidan), showing signs of decline long before the Anshi Rebellion. The subsequent Anshi Rebellion did bring the whole Tang Dynasty down to a new height, but it only made it worse. This is by no means "from prosperity to decline". The Tang Dynasty never began to decline from the Anshi Rebellion, nor did it decline because of the Anshi Rebellion. Some people tried their best to mislead people, thinking that the Tang Dynasty before the Anshi Rebellion had flourished and the people lived and worked in peace and contentment, which was the most prosperous time of the feudal dynasty in 2000. If this prosperity lasted for hundreds of years, it would not be a problem. Just because of the great changes in the Anshi Rebellion, the flourishing age suddenly ended ... In fact, these are all nonsense, just trying to blame all the responsibility for the decline of the Tang Dynasty on the historical guilt that Emperor Taizong should bear and let go of the Anshi Rebellion.

It is worth noting that since Emperor Taizong, the ruling classes in the Tang Dynasty have been kind and dependent on the Hu people. In addition to their own lack of strength and need to rely on external factors, there is another important reason. The Tang Dynasty itself was a Xianbei Hu people, so it was a disaster to get close to the Hu people and let them develop, which led to serious consequences and dragged China into the troubled times of the Five Dynasties and Ten Countries. From then on, the nomadic people in the north became stronger and suppressed the Central Plains for thousands of years, all of which were brought about by the stupid ethnic policy of the Tang Dynasty.