Final answer:
Japan invaded Manchuria in 1931, sparking international tensions and leading to the establishment of Manchukuo under Japanese control.
Explanation:
Japan invaded Manchuria in 1931, which sparked anger among many European countries. This invasion, known as the Manchurian Incident, led to the establishment of the puppet state of Manchukuo by Japan in the following year. The League of Nations condemned Japan's actions in violating the sovereignty of Manchuria but was unable to impose sanctions.
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