This is why I want a total rework of the Japanese political tree. It isn't great for historical purposes and the USA never really does anything other then let it happen which is completely inaccurate because the USA Guaranteed that an attack on South-east asia would bring in some form of intervention from the USA albiet similar to the philippines, it wouldn't have done much.The problem lies on why Pearl Harbor happened. Pearl Harbor and the entire Japanese invasion of Asia happened because Japan was facing a vary harsh embargo of Oil and financial assets, made by the USA, leaving them with very few options. They choose to go to war, in the hope of gathering all necessary resources to fight a defensive war aiming for a future peace treat where they would keep the status quo of the region.
Japan never faces a harsh embargo in HoI4. Even with the implementation of the embargo option, which is quite expensive, 200 pp, IMO. That could be solved if it were cheap, and major nations could force other countries to do embargoes against their potencial enemies. Maybe using spies.
And about the reasons to USA fight against Japan... Maybe should be implemented a new World Tension, but between countries. I don't know how.
However, thinking about it, i only believe that would be possible with a South-East Asia DLC (Siam, the Philippines, and British Malaya and Dutch East Indies really need focus trees tbh and the Pacific Theatre is honestly not balanced to be honestly.) Yugoslavia had their political tree reworked completely during BFTB which was a positive step, and something I think can only be done with such, but I think we can think of a few good changes first off.
I'll unfortunately have to look at Wikipedia for some ideas.
A good start would be to give the USA an event after Japan demands Indochina or seizes it and that they have to return it to France (probably Vichy because the USA preferred working with them and Roosevelt even disliked de Gaulle They could throw in making peace with China but that be more on paradox's part.) Japan denies it, and the USA applies an embargo for free on the Empire of Japan, which opens up a new focus to bomb pearl harbor which would give the USA a negative debuff on their ships for about 1 month (Mainly about repairing ships and their speed) and Japan to gain massive bonuses regarding naval invasion capacity and speed of the naval invasion, and bonuses for attacking the British, Dutch, and Americans and their colonies about 3 months for a 5% bonus.
I don't think we can completely 100% portray realism with HOI4, and I certainly don't want to because all of the dark things, but I would at least like some accuracy and reasoning as to why Japan would do some things.
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