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What if the US intelligence agencies figure out that the Japanese target on December 7th is going to be Pearl Harbor.
Lets say FDR looking for a reason to get the USA into the war lets the attack happen but now the Japanese navy is walking into a huge trap.
What does a total defeat do to the Japanese war effort? Does the US become too complacent, underestimate the Japanese, and end up with a bloody nose later?
Does Hitler rush to declare War on the USA if the IJN does not impress him with a great opening strike? Does an early show of American might make him rethink his policy towards the US?
What happens if Yamamoto is lost in the attack? If he survives what happens to him? Suicide? Assasination?
How does defeat at Pearl harbor effect the rest of the upcoming Japanese offensives?