may 4, 1919 - The May Fourth Movement

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(This is the specific event it is named for, not the movement as a whole.)
Students protest in Beijing over the Chinese government's weak reaction to the Treaty of Versailles (particularly the parts that let Japan have the Shandong Peninsula, which was China's. During the war, China had fought under the impression this territory would be returned to them at the end...)
Many eventually famous and influential figures were involved in the movement, including Mao Zedong and Zhou Enlai.

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