Assuming you are playing with National Objectives.
Well, If USA spends all its money in the pacific each turn (plus moves its bombers and everything in that direction), then you can have that match-up without requiring anything special from germany or russia.
Japan starts out making 17 or 31 a turn, depending on 1941 or 1942, but after taking the money islands plus half of china plus india, Japan is making about 55 on turn 3, and up to 65 by turn 5.
USA starts out with 40 or 38 a turn, and after 2 turns should be making 48. If USA is going pacific, then USA will never make more than 48 a turn.
At the end of the first round, Japan has a fleet of expensive ships left, as well as a ridiculous number of fighters. America has almost no fleet at all at the end of the first round, and pretty much has to build one from scratch.
I’ve play a ton of games where America went all out in the pacific. Japan can spend 100% of her income turn 1 towards mainland asian forces, then dropping down to 2/3rds of her income turn 2, then down to between 1/4 and 1/2 of her income the rest of the game on mainland forces. She can knock out any American Navy that gets within range (2 spaces) of Formosa, and this usually happens on turn 4 or 5. Even with America forcing Japan to spend money on Pacific boats, Japan can still afford to capture all of China, India and Persia, as well as several Siberian territories, and have a good sized Japanese force sitting on the doorstep to the Caucasus on turn 6, or at the latest turn 7.
Result: With NOs, Japan can decimate any American Navy and still make it to Russia by turn 6 with a decent force. (Meanwhile, for the first few turns Britain will be unable to take both Norway AND maintain control of Africa, therefore Britain has to pick one. Russia then either has to fend off all of Germany and Italy by itself, or if the Brits help via Norway, the Axis get Africa and the game is lost)
