Why did the Li family establish the Tang Dynasty?

The Li family was originally an important family in Guanlong military aristocratic group. From Yu Wentai's support to Yuanbaoju's establishment of the Western Wei Dynasty in Guanzhong, from the Western Wei Dynasty to the Northern Zhou Dynasty to the Sui Dynasty and then to the Tang Dynasty, the four emperors were all military nobles from Guanlong Group. Even Shi Mi, the leader of the Wagang Army, came from this group.

Married Xiao from the royal family in the Southern Dynasties, instead of marrying Guanlong aristocratic group according to tradition. Although there were political considerations for Emperor Wendi of Sui Dynasty and Dugu Jialuo to win over the people in the south of the Yangtze River, even if Yang Guang succeeded in proclaiming himself emperor, he was an outsider in Guanlong Group. Later, Yang Guang didn't bite the string with Guan Long Zhu Zhu country, which made Yang Guang uneasy in Chang 'an. He left Chang 'an many times in the name of patrol, and even later planned to stay in Jiangdu instead of returning to Guanzhong. In Guanlong Group's view, these behaviors are undoubtedly traitors rather than alienation. There was chaos in the world, and when the Sui Dynasty was about to fall, the Li family, who was also born in Guanlong, stepped forward and attacked the hometown of Xiaguan in one fell swoop, giving orders to the world. Guanlong Group naturally turned to fully support Li Tang. This was the biggest political capital and solid ruling foundation of the Li family at that time.

In addition, the comprehensive military and political quality of Li and his son was indeed the highest in the competition at that time. Not to mention that Li Shimin is the only emperor in China who can be called a strategist (the battle between Luoyang and Hulaoguan is a glorious example in the ancient military history of China), and Tang Gaozu, Li Chengjian and Li Yuanji are by no means mediocre and incompetent people who were deliberately smeared and sheltered by Li Shimin Group after the change of Xuanwu Gate.

On the whole, the Li family, as an important member of Guanlong Group, broke off diplomatic relations on time, occupied the traditional ruling center in Guanzhong area, and won the support and loyalty of most old aristocratic bureaucrats in Sui Dynasty headed by Guanlong Group. Li Tang, who got the first chance, did have excellent military and political abilities, planned properly, divided his opponents one by one and razed the north one by one. Then Jiangnan is a bloodless sword, and it's settled.