Changes

For years, the Chinese had conducted their foreign policy through the tribute system, in which foreign powers wishing to trade with China were required first to bring a tribute to the emperor, acknowledging the superiority of Chinese culture and the ultimate authority of the Chinese ruler. Unlike China’s neighbors, the European powers ultimately refused to make these acknowledgements in order to trade, and they demanded instead that China adhere to Western diplomatic practices, such as the creation of treaties. Although the unequal treaties and the use of the most-favored-nation clause were effective in creating and maintaining open trade with China, both were also important factors in building animosity and resentment toward Western imperialism.

United States Department of State

https://history.state.gov/milestones/1830-1860/china-2