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What would the Japanese do differently if they could not attack the main elements of the U.S. Pacific Fleet? Would they still send the Kido Butai to Hawaii to attack the air bases and naval facilities? Where else could the Kido Butai have bent sent? Singapore?
How much different would the opening phase of the Pacific War had been if their was no attack on Pearl Harbour? The U.S. would still have to be attacked? I would assume the operations against the Philippines would still proceed.