オレンジ計画
Japan had used the opportunity afforded by World War I to establish itself as a major power and a strategic rival in the Pacific Ocean. After the war, most American officials and planners considered a war with Japan to be highly likely. The fear lessened when the civilian government of Japan temporarily halted its program of military expansion, which was not to resume until 1931. War Plan Orange was the longest and most-detailed of the colored plans.