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====Why did the Open Policy fail to protect China?====

In 1900, however, internal events in China threatened the idea of the Open Door. An anti-foreign movement known as the Boxer Rebellion, named for the martial artists that led the movement, gathered strength, and began attacking foreign missionaries and Chinese converts to Christianity. With the backing of Empress Dowager Cixi (Tz’u Hsi) and the Imperial Army, the Boxer Rebellion turned into a violent conflict that claimed the lives of hundreds of foreign missionaries and thousands of Chinese nationals. As the Boxers descended upon Beijing, foreign nationals living in that city—including embassy staff—clustered together in the besieged foreign legations, and called upon their home governments for assistance.

With foreign armies fighting their way from the Chinese coast to rescue their citizens in the capital, in some cases securing their own concessions and areas of special interest along the way, the principle of the Open Door seemed to be in grave danger. On July 3, 1900, Hay circulated another message to the foreign powers involved in China, this time noting the importance of respecting the “territorial and administrative integrity” of China. Although the goal was to prevent the powers from using the Boxer Rebellion as an excuse to carve China into individual colonies, the Open Door Circular requested no formal agreement or assurances from the other powers.