May 7, 1915, China was given an ultimatum from Japan, whether or not accept the "Twentiy-one Demands". At that time the Great Powers were all involved in the European Wars and thus had no room to care about East Asia. After 4 months' negotiation, China was forced to accept. This result made the whole China furious, and called the "National Shame of May 7". It also casted great variables to domestic politics in Early Republican China as well as the balance of power in East Asia. For details you may refer to our research finding: Lee Yu-shu, Sino-Japanese Negotiation over Twenty-one Demands.
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