Why did Tubo fight the Tang Dynasty and not Tianzhu?

Tubo has long learned Buddhism from Tianzhu and relied on Tianzhu's Buddhist import, so it did not start a war with Tianzhu, and the Tang Dynasty had no interest in Tuzhu, so it naturally fought.

Tubo and Tianzhu are indeed relatively close in distance, but the reason why Tubo provoked the war was to rob living materials, and the scarcity of Tianzhu materials was no less than that of Tubo, even if Tianzhu was attacked, it was meaningless.

Tianzhu and Tubo were blocked by the continuous mountain range, the terrain was too steep, although the Tang Dynasty was at its peak, but Tubo was not weak. After the Anshi Rebellion, Tibet expanded its territory even more.

Starting from the Tang Dynasty, the Great Wall has been under the seal of China, the people of all ethnic groups must unite together,,,,,, the Tang Dynasty, all countries come to the dynasty, the Tang pioneers, inside and outside the Great Wall, thousands of miles of rivers and mountains, the glory of the ancient Ming Emperor Li Shimin, on the horse can fight, off the horse can govern the country.

The Tang Dynasty could not defeat Tubo because the state was difficult to control, and there was also the influence of the Anshi Rebellion.

In the middle and late Tang Dynasty, the local jiedu envoys grasped the local economic, political, and military rights, and looked like a local emperor, which made it difficult for the state to rent and control. Tibet, on the other hand, had a more centralized political system, which made their rule more effective. The Tang Dynasty was at a disadvantage many times in the war with Tibet.

Especially after the end of the Anshi Rebellion, the Central Plains withered, the vitality of the imperial court was greatly damaged, and the hard power of the army, the economy, etc., all fell to a very low point, and naturally they could not defeat others.

Most of the areas invaded by the Tibetans were rich in property, and there was no need to establish logistical supplies on their own, and they could be used to loot. The Tang Dynasty needed to transport materials over long distances, the supply lines were long, and the logistics were difficult, which was also one of the reasons why the Tang Dynasty was at a disadvantage in the war.

Peculiarities of the development of the Tang Dynasty

The Tang Dynasty was a glorious period in Chinese history, and its economic development, urban pattern, transportation development and commercial development all showed certain characteristics. The Tang Dynasty had a prosperous economy and strong national strength, which was the highest peak in the history of the development of China's feudal society. The urban pattern of the Tang Dynasty adopted the fang market system, with clear boundaries between each residential area, and the market was set in a designated place, and no random transactions were allowed.

Although the fang market system is extremely rigid, it is conducive to urban management.

In terms of transportation development in the Tang Dynasty, water transportation was very developed, and the transportation was mainly a post station, and the water network spread all over the country. The commercial development of the Tang Dynasty had four characteristics: developed transportation and monetary system.

First, the market is developed and there are many businessmen. The Tang Dynasty was also very developed with the outside world, and had contacts with Japan, Persia, Arabia and other countries.