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The U.S Military intelligence had been monitoring the Japanese military movements and attempting to intercept their messages since 1936 after the Japanese invaded Manchuria. (And on the mainland, the F.B.I. had been monitoring contact between the Japanese-American population to their families in Japan.) The U.S. military knew the Japanese were intending to attack, especially since the U.S. had naval bases spread out in the South Pacific, and therefore understood it was a matter of time, however, no one knew exactly when. Intelligence experts thought the Philippines to be the most likely target.

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11y ago
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13y ago

because the Japanese left tiny clues for the other Japanese to find but instead the American found it

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Q: How did US know that japan was going to attack?
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