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Following seizures of German territories in 1914, the League of Nations granted Japan mandates over some former German possessions in the Western Pacific after World War I. With the Japanese expansion into Manchuria in the early 1930s, Japan adopted a policy of setting up and/or supporting puppet states in conquered regions. In this less obviously imperialist form Japan controlled many of the states of what it referred to as the Greater East Asia Co-Prosperity Sphere, a concept which gradually formed under Japanese influence from 1930 to 1945. Colonial control over the far-flung territories from Tokyo ended after the Allies defeated Japan in 1945: the extent of Japanese governance reverted to the four home islands, the Nanpō Islands, and the Ryukyu Islands.
1945