I think the first question is to establish clearly a set of goals for the US on the Pacific Map.
I cannot see a direct invasion of the Japanese home islands succeeding until Naval superiority has been achieved. (unless Japan makes serious errors)
A possible goal for us is to assist the Asian allies. Each one of the 4 has different needs and abilities.
1. Assist Anzac
2. Assist China
3. Assist Russia
4. Assist UK Pac
Anzac.
Anzac is no pushover and Japan will have a hard time getting enough troops into position to take and hold.
China.
China is weak, little more than a series of speedbumps. but it can easily be reborn
Russia.
Strong defensively, weak on offense
UK Pacific
Furthest away from US. US can potentially scare Japan away so Brits can retake islands
Out of the 4 Anzac is probably in the strongest position to take offensive action. But cant threaten Japan by itself. What Anzac needs is something to take the heat off for a few rounds so that they can build up their income by capturing a few islands. Russia can be activate to make use of the stacks of infantry. China can be rebuilt in the North with the aid of Russia.
Into this equation we have the US. They are able to pick and choose what to do in order to tip the scales and give the other 4 a fighting chance. The biggest threat to the US is Japans starting air force. Provided we take this into account we can plan out first 5 turns.
Here’s my strategy
1. Russian Express.
Japan has a real blind sport which can be exploited in the far north. 4 transports moving tanks and Infantry from alaska to SFE can dramatically shift the land battle in Asia. Russian Inf join push into Manchuria and Korea.
2. Sub Blitz
20 submarines blockading Japanese home islands and surrounding areas. Subs ignore Japans air power and kamikazes too. I don’t mind losing a few subs here and there if Japan is losing ships too.
3. American Air
Station US Airforce in korea to add to Japans headaches. Build Korean factory to add more pressure on Japan.
Its only after setting up this that the US moves into building surface fleet for more wider operations against specific targets. This strategy completely ignores Pearl, Carol, Phill, Midway etc in exchange for the economic strangulation of Japan. The 4 minor powers can then do their bit to nibble away at the edges. continuous battles of attrition will hopefully erode Japans ability to replace land forces quick enough.
If Japans income can be kept in the 40-50 range they will never reach the break out level.
Overall eventually a major confrontation will occur, but as US I want to make sure Japans air is tied up fighting in China and their ships are spread thin trying to stop my termites (subs) bringing the house down. This also allows Anzac more breathing room and opens up opportunities for sneak attacks against key islands.