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War Plan Amber was one of the color-coded war plans drafted during the interwar by the United States. It dealt with a potential war with Japan as a back-up to War Plan Orange, formented by the early events of the Second Sino-Japanese War and a formalization of Anglo-American alignment in the region. Its core tenet was a land war against Japan in Southern China via the British Raj and Burma, with U.S. naval forces in the East Pacific (i.e. Hawaii and the United States) on the strategic defensive until naval production could be ramped up. The plan assumed early defeats at the hands of the IJN had attrited the U.S. Navy to the point that it could not conduct offensive naval operations in the Central or South Pacific Areas until disparities in naval superiority had been rectified. It also assumed that the British would be an ally of the United States in a war against Japan. Read more...