China, like other countries in the world, is constantly developing according to the laws of the development of human society. By the end of feudal society, the development of commodity economy had bred the seeds of capitalism. However, in11940s, this process of independent development was interrupted. Capitalist powers opened the door to China with artillery, opium and cheap goods, and gradually colluded with the feudal rulers of China to achieve their goal of monopolizing China. In this way, China gradually fell into the abyss of semi-colonial and semi-feudal society. Since then, the Chinese nation has become an oppressed nation.

First, in June of 1840, Britain invaded China by force and launched the Opium War. The British invaders burned, killed and looted, and ran roughshod over the territory of China. 1842 In August, the British invaders forced the Qing government to sign the first unequal treaty in modern China-Sino-British treaty of nanking. The following year, Britain forced the Qing government to sign the annex of treaty of nanking. After the Opium War, China gradually changed from a feudal society to a semi-colonial and semi-feudal society. The principal contradiction in China society has changed from feudalism to the masses, to foreign capitalism and the Chinese nation. Since then, the people of China have started the struggle against foreign invaders and their feudal rulers. The history of China has entered the period of the old democratic revolution.

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