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解析:
China's defeat in the Opium War exposed her military backwardness and political weakness.Western powers found that it was easy to force her to accept unequal conditions．So after the war, British and other western countries, including France, Germany, Russia, the United States, and Japan in the east, separately or jointly started aggressive wars on China, or bullied China in different ways.
Chinese history in the second half of the nineteenth century was full of such humiliating events．They marked the turn of China from a feudal country into a semi-colonial and semi-feudal country.