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So I watched Tora, Tora, Tora! for the first time a few days ago (review in short: it's boring, insanely stiff for something made in 1970, and the whitewashing/hero worship of Yammamoto is off the charts), and was struck by how the Japanese (apparently, options differ) planned to deliver the U.S. a declaration of war, than strike at Pearl a half hour later (the film makes a great deal of Yammamoto, and by proxy Hirohito, insisting on this point). Supposedly the DoW was delayed because the typist was slow, and it wasn't delicered until the raid on Pearl Harbor was already underway/competed.

Now, I've heard it (somewhat convincingly) argued that Japan always planned to strike without a DoW, but for the sake of argument let's assume that it really was the typists fault. What happens if the Japanese had gotten the timing right, and had declared war on the U.S. immediately before the raid on Pearl had commenced? Would the U.S. be as "filled with a terrible resolve", as Yammamoto (apocraphyly) put it? How does this affect the rest of the war?
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