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Yes, the code was already broken right before the attack on Pearl Harbor even started. President Roosevelt already knew about the Japanese was going to attack Pearl Harbor, but he didn't know for sure if it was true. Yes, the code was already broken right before the attack on Pearl Harbor even started. President Roosevelt already knew about the Japanese was going to attack Pearl Harbor, but he didn't know for sure if it was true.

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16y ago
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Q: On Pearl Harbor did the US ever undo the code?
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