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Nailed the carriers at Pearl for a start. But also developed new and better fighter and bomber aircraft that were on a par with the Allied air forces.
That's a bit hard to do when they aren't there. Enterprise by rights should have been there, and I'd imagine at least half the torpedoes that hit the Oklahoma and West Virginia would have clobbered her.
One thing they could have done is go after the oil storage, sub base, and repair bases. There could have been a third wave with those as targets.
The fact that they didn't go after such targets to me points out one of the great failings of the Japanese, the fact they didn't think that such things as supplies, mechant convoys, etc, were "sexy" enough, or honorable enough, to bother with. That was a big mistake as far as their submarine forces were concerned. They were used for scouting, or attacking warships, instead of all the transports, oilers, and supply ships.
Along similar lines was their failure to develope effective anti-submarine warfare enough. While the British were masters at ASW, and were able to support themselves, the Japanese were reduced to mounting depth charges on ships like cruisers, which kind of shows how desperate they were. Even so they pretty much destroyed as a nation by the US submarine campaign. More effective ASW would have at least prolonged matters.
Lastly they didn't arm their destroyers with a good double purpose main gun, like the American 5" 38 D.P. Their destroyers were much less effective at stopping the air attacks than American cans were. This also could have prolonged the war a bit.
I do wonder this what would have happened if the Japanese followed David, Drader's, plan. I understand the need to protect their sea lanes and flanks, but I tend to agree that it might have been much harder for FDR to get the Americans into it, if America herself wasn't directly attacked. Even if the Japanese took over all of the territory they attacked except Pearl Harbor and the P.I. would that have been enough to get the Americans into the war?