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What difference (if any) would it have made if the Japanese foreign ministry had delivered their declaration of war BEFORE the Pearl Harbor attack? Yamamoto seemed to be pre-occupied with not "enraging" the Americans, for fear that they (we) would perceive the attack as betrayal, or a stab in the back, and be filled with anger which we would use against the Japanese.

But, if you ask me, an attack is an attack regardless of formalities.

*edit- To clarify, I mean what effect would it have had on the American public's perception of the attack. If the declaration was delivered on time, Admiral Kimmel and General Short could have been given additional time to prepare, which might have resulted in a different version of the Pearl Harbor raid, but with little other affect on the war, except perhaps to accelerate American victory.
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