Many mistakes players make are to over invest in the Pacific and “go for the win” in the Pacific.
To successfully prevent Japan from winning in the Pacific you need to match him carrier for carrier, destroyer for destroyer and fighter for fighter in the Pacific. Well, that’s only partially true, America needs this equipment to contain Japan, add to that destroyers and submarines from Australia and India for use in “trading” with Japan.
Often times I like to add a carrier for Australia, sometimes even two carriers. This adds a lot of defensive punch and that’s what you are really looking for in the Pacific. However, these are a secondary concern, your primary concern must be to have no less than 3 destroyers to use in blocking the Japanese warships!
It is often necessary for the United States to purchase a naval and / or airbase in the Pacific. Unfortunatly, this will end up replacing destroyers that America would otherwise be purchasing, so it is often wise to save 5 or 6 IPC a round for the United States to assist (that way you have 21-22 IPC set aside for the Pacific each round, if you have to drop a base, that leaves you with enough that you can still drop a destroyer without greatly upsetting your Atlantic planes, as it is only an extra 1 or 2 IPC you lost from your Atlantic mission!)
Atlantic side is another faltering point for the United States. Many people are inclined to keep building warships well after the mission objectives have been accomplished, because it’s what they have always done! Once you control the Med and have a few warships to protect transports from Strategic Bomber attacks in SZ 91, you can stop investing in warships for the Atlantic. Actually, you can stop investing in armies as well, since you can just use what you have stockpiled if you need too. (Best solution might be to downshift and send only partial shipments to replace losses.)
Essentially, by round 11, I expect the Pacific to look thusly:
Japan: 15 Aircraft, 5 Aircraft Carriers, 2 Battleships, 2 Cruisers, 6 or 7 Destroyers, 3-5 Submarines, 7 or 8 Transports
America: 8 Aircraft, 4 Aircraft Carriers, 1 Battleship, 1 Cruiser, 6 or 7 Destroyers, 5-7 Submarines, 2 or 3 Transports
Australia/India: 7 Aircraft (3 Airbase, 4 Carrier), 2 Aircraft Carriers, 1 Battleship, 2 Cruisers, 4 or 5 Destroyers, 2-4 Submarines, 3 Transports (1 British, 2 Australian)
Atlantic side we are looking at:
Germany: 1 or 2 Submarines, maybe + 11 Aircraft
Italy: Nothing
England: 1 Battleship, 2 Aircraft Carriers, 1 Cruiser, 2 or 3 Destroyers, 1 or 2 Submarines (maybe, for Convoys in SZ 125, SZ 105), 3 or 4 Transports, 6 Fighters - Fleet in SZ 109 or SZ 110
France: Fighter, Destroyer (in the Med)
USA: 1 Battleship, 2 Aircraft Carriers, 1 Cruiser, 4 or 5 Destroyers, 2 or 3 Submarines (for Convoys), 8 Transports, 4 Fighters - Fleet in SZ 91 or SZ 92