The game is pretty even, in fact usa 1 i always buy 3 units pacific sub/dd mix. usa 2-3 depends if germany does sea lion or not. no sea lion = i purchase to shut italy down and out of the game with the rest going to pacific (at the least 3x sub/dd for pacific). usa 3-5 is mostly pacific. I just buy a skeleton fleet to just guard UK transports from germany with trickles of carrier 2x fighters or dds coming in.
key elements to this is keeping at least 1 or 2 uk transports alive in the india/africa seazones to ensure italy is shut down (usually 2, after sumatra i bring that transport back in).
all usa has to do is provide navy to guard uk’s 5 transports on Uk so he can shuffle 10 guys a turn no prob. usa is too inefficient with transports. typically usa got 2-5 depending, but as long as you protect uk’s naval so uk can just buy ground units to drop, you will be fine. if you can’t get a foothold in normandy or whatever. you can always march norway->finland -> karelia->nov-> wherever.
another element to this strategy is shutting japan down from the cash islands before the fall of russia so you can turn around and focus on guarding egypt and the united kingdom. keeping calcutta alive is important.
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If usa spend all atlantic, I see no problems in japan winning the game on the pacific side of things. if usa spends no atlantic i don’t see how russia can even stand a chance or how egypt will be out of germany/italy grasp when russia falls.
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alternatively you can do a europe emphasis and just always buy subs/dds for pacific (cheap stuff) and go heavier in atlantic.