@DoManMacgee All America has to do is spend 25% or less to divert such an attack from Honolulu or Sydney while Japan tries to catch up economically to the US while taking out Calcutta, China, Money Islands, etc.
Yes, America going 100% KGF leaves that option open for Japan but that’s not even a realistic strategy. America would likely spend at least some money in the Pacific. As well, America can spend very heavily in the Atlantic for a few turns and shuttle transports back and forth to the Eastern US, spending less than half its money on re-stocking those transports to go back to Germany/Africa/Italy.
Once America has established complete domination over the Atlantic (thereby allowing the UK to build a navy once again) it can spend the majority of its money on the Pacific, nullifying a Pacific victory by Japan.