IRL all Japan could hope to achieve is to inflict enough loses that USA agrees to a white peace and lifts the oil embargo (and I think even that is far fetched)
I don't' know in Hoi IV (obviously) but if AI is competent the only (slim) chance should be to sink their fleet to achieve full naval superiority in the pacific in the first months of the war and invade them while their army is still weak. If you give them enough time to switch civilian factories to military factories or to rebuild/reinforce their navy they will drown you on planes, ships, tanks and artillery. And that strategy might be very hard to do since a) invasions take time to plan b) with new naval mechanics forcing a decisive battle to achieve naval superiority migh be difficult.
Alternatively , you migh wanna dig in in the pacific, tie as many USA resources as possible, try to help Germany against the Soviet Union and pray that Germany wins with some manpower intact and starts to build a serious navy to help you invade USA before Uncle Sam comes knocking to mainland Japan with strategic bombers and nukes.
I don't' know in Hoi IV (obviously) but if AI is competent the only (slim) chance should be to sink their fleet to achieve full naval superiority in the pacific in the first months of the war and invade them while their army is still weak. If you give them enough time to switch civilian factories to military factories or to rebuild/reinforce their navy they will drown you on planes, ships, tanks and artillery. And that strategy might be very hard to do since a) invasions take time to plan b) with new naval mechanics forcing a decisive battle to achieve naval superiority migh be difficult.
Alternatively , you migh wanna dig in in the pacific, tie as many USA resources as possible, try to help Germany against the Soviet Union and pray that Germany wins with some manpower intact and starts to build a serious navy to help you invade USA before Uncle Sam comes knocking to mainland Japan with strategic bombers and nukes.
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