Both the Sui and Tang dynasties carried out several conquests and invasions of Goguryeo, and eventually destroyed it. So, why did both the Sui and Tang dynasties destroy Goguryeo?
First of all, Goguryeo is an ancient country in Chinese history, and its geographical location is very important. Located in northeastern China, Goguryeo is a choke point between China and the Korean Peninsula. Therefore, the presence of Goguryeo has a very important impact on China's security and stability. Both the Sui and Tang dynasties believed that if Goguryeo was not destroyed, it would become a threat to China, adversely affecting China's security and stability. Therefore, both the Sui and Tang dynasties decided to destroy Goguryeo in order to protect China's security and stability.
Second, both the Sui and Tang dynasties hoped to expand their territories and spheres of influence by destroying Goguryeo. Both the Sui and Tang dynasties believed that Goguryeo was a very wealthy country and that controlling Goguryeo could gain a lot of wealth and resources. In addition, Goguryeo was an important trading country, and controlling Goguryeo could control the trade of the Korean Peninsula and Northeast Asia. Therefore, both the Sui and Tang dynasties hoped to expand their territory and sphere of influence by destroying Goguryeo, and increase their strength and influence.
Finally, both the emperors of the Sui and Tang dynasties hoped to establish their merits and prestige by destroying Goguryeo. In ancient China, conquest of foreign tribes was a very important political means that could be used to establish the merits and prestige of the emperor and enhance the emperor's dominance. Both the emperors of the Sui and Tang dynasties hoped to consolidate their dominance by destroying Goguryeo to establish their merits and prestige.
To sum up, both the Sui and Tang dynasties wanted to destroy Goguryeo because the existence of Goguryeo had an adverse effect on China's security and stability, and at the same time controlling Goguryeo could expand its territory and sphere of influence, increase its own strength and influence, and at the same time establish the emperor's merits and prestige and consolidate its dominance.
In addition, Goguryeo's relationship with the Sui and Tang dynasties was also very complicated. In the early days, Goguryeo was a vassal to the Sui Dynasty and maintained friendly relations with the Sui Dynasty. However, corruption and internal strife during the reign of the Sui Dynasty led to a gradual weakening of its power, and Goguryeo became dissatisfied with the Sui Dynasty and gradually broke away from the control of the Sui Dynasty. During the Tang Dynasty, Goguryeo was once a vassal to the Tang Dynasty, but the rulers of the Tang Dynasty also began to develop a sense of threat towards Goguryeo, and repeatedly carried out conquests and invasions of Goguryeo. During the Tang Dynasty, Goguryeo also began to seek help from other countries, such as Japan. Eventually, after the fall of Goguryeo, the Tang Dynasty established a satellite state called "Silla" to control the Korean Peninsula region in order to consolidate its dominance.
In addition to being a vassal to the Sui and Tang dynasties, Goguryeo also established friendly relations with other countries. For example, there were also cases of alliance and joint resistance between Goguryeo and Baekje and Silla. In addition, Goguryeo sought help from the Turkic peoples in the north and the Jingqi in the northeast to resist the invasion of the Tang Dynasty. In the history of Goguryeo, there have also been some famous generals and heroic figures, such as the great general King Lelang, the female general Princess Huasan and others, who played an important role in defending the national interests and national dignity of Goguryeo. In general, the history of Goguryeo is full of twists and turns and wars, but it has also left many heroes and legends.