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The Boxer Rebellion, also known as the Boxer Uprising, was an anti-foreign and anti-Christian movement that took place in China between 1899 and 1901. It was led by the Yihetuan, a group of martial arts practitioners and peasants who believed that they were invulnerable to foreign weapons. The rebellion was sparked by resentment towards foreign influence in China, including the presence of foreign troops, missionaries, and merchants.