The slogan of the boxer movement is

The high school history teacher answered you: the slogan is "help the Qing Dynasty to destroy the foreign countries". On the one hand, it shows that the main contradiction in China society at that time was the contradiction between imperialism and the Chinese nation. (The two major social contradictions in modern China: the contradiction between imperialism and the Chinese nation and the contradiction between feudalism and the masses of the people, will have different emphases in different periods, that is, the two major contradictions will fluctuate. On the other hand, it shows that the Boxers relaxed their vigilance against the Qing government, which became an important reason for the failure of joint suppression by reactionary forces at home and abroad.

I hope it helps you.