The cultural thought of the Chinese nation has been developed and expanded to adapt to the surrounding tribes and improve its own shortcomings. What is bad is the monetary consumption system, especially in the later period, when the tributary countries came to pay tribute and took away a lot of gold, silver and jewels, which brought great pressure to the finance of the Central Plains Dynasty. Judging from the unification of the Qing dynasty, the neighboring countries have much less political power. Different from the Ming Dynasty, the Qing Dynasty not only brought Mongolia, Xinjiang and other places into the territory, but also achieved a unified pattern. In the Qing dynasty, going to sea was strictly forbidden. Without overseas trade, there is no contact with overseas. It is equivalent to the interruption of exchanges between the Qing Dynasty and foreign countries. Whether for economic and trade exchanges or other purposes, the Qing Dynasty missed the opportunity. The late Qing thought was stubborn and backward, unwilling to learn from others.
In the Qing dynasty, vassal States didn't care much. They just develop in isolation and don't understand the outside world. Seven tributary countries are in the east and south, and none is in Central Asia. Perhaps the Qing Dynasty thought that the tributary system was too expensive and did not need so many tributary countries. During the Qianlong period, the Philippines wanted to be a part of the Qing dynasty, but the Qianlong emperor didn't want it. It can be seen that the ruler's territory is large enough and does not need so much. In addition, the world is getting worse, the Qing dynasty is stagnant, and their thoughts are stagnant.
In the Qing dynasty, some things remained unchanged and some things changed. What remains unchanged is thought and arrogance. What changed was the world pattern and the neighboring countries of the Qing Dynasty. All these will lead to the reduction of the number of tribute countries in the Qing Dynasty. The Qing dynasty didn't want to preach the power of the country. He feels very good.