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Hungary joins the League of Nations, which creates even more of a threat to Japan.
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Japan assassinates the Manchurian warlord Zhang Zuolin, which causes even greater tension.
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Italy, Japan, the UK, & the USA sign the London Naval Treaty which regulates the utilization of submarine warfare.
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The Japanese invasion of Manchurian triggers the fighting of the second Sino Japanese War
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Japan & Germany sign the Anti-Comintern Pact that's directing against communism in the Soviet Union.
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The Marco Polo Bridge Incident was a battle between China & Japan, start of the second Sino War.