Answer:The Second Opium War was a war of aggression against China jointly launched by Britain and France from October 1856 to October 1860 with the support of the United States and Russia. Its purpose is for Britain and France to further open up the Chinese market and expand their aggressive interests in China. Because Britain and France used the Yarrow incident and the horse priest incident as the pretext of starting wars, it was called "The Arrow War" by the British. Also known as the Anglo-French expedition to China or the Second Anglo-Chinese War. At the same time, because this war can be regarded as a continuation and expansion of the First Opium War (the essence and purpose of the two wars are the same), it is also called the "Second Opium War".
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