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Reportedly, the Japanese secret "purple" diplomatic code had been cracked by the US a year before Pearl Harbor. The military in Washington DC had informed President Roosevelt and Pacific fleet commanders that a Japanese attack could come at any time. Apparently the exact location of an attack was unknown. Needless to say, based on the ill feelings between Tokyo and Washington DC, added to the fact that Japan had been combat ready since its 1931 invasion of China, all US Pacific bases should have been on alert.

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Q: When did the US crack Japan's ultrasecret Purple diplomatic code?
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