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Imperial Japan was almost totally unaffected by World War I, making sizable gains for little human and financial cost. What if Imperial Japan took advantage of its position relative to the other great powers, especially the war-weariness of the postwar era, in order to begin expanding its power in East Asia? For example, what if Japan established a puppet state or annexed the gains it had made during the Siberia intervention, and supported the "Mad Baron" Roman von Ungern-Sternberg in Mongolia?