EX: If the Nimitz went backward in time to Dec 7th 1941, Would they have to wait for the Japanese to strike Pearl Harbor? You will recall in the history of the war, the Japanese didn't declare war until after the attack. This was a purely logistical delay on the Japanese decoding the message from Japan.Great movie and funny that you’d bring it up now. Just yesterday I was speaking with someone about the movie. Guess I’m being a dolt @Snattlerake but to what interesting questions are you referring?
This was in America's favor for it was now a sneak attack without a formal declaration and led to the intense hatred toward the Japanese the American public attained.
Would the Nimitz declare war on the Japanese without congressional or presidential approval? That is what they would be doing.
Capt Yelland, Kirk Douglas, stated this in the movie. He said the only evidence of the attack they had was in the history books.