Faralis
Well worn.
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TBH, the US had plans to enter the war around March or April of 1942 against Germany, anyway. Specially since Barbarrosa, they new a war was inevitable...The problem is that the Japanese economically dependent on the US for war materials necessary for expansion, and that most of the people making decisions were from young officer cliques in whose entire plan was 'Russo-Japanese war 2.0' without understanding why that plan had been successful.
Now that being said, I don't think with Japan was unavoidable, Japan had internal off ramps, but the leadership basically talked themselves in the war. If the Pro-US, Anglo-AMerican wing of the army gets power if Iesato, or frankly some of the other anglophile Tokugawas survive longer than historically or if frankly the Kwantung army leadership actually got sent to prison for their shenanigans Pearl probably never happens. Indonesia probably still gets invaded, and maybe Indochina (iesato dying in 40 is the only reason the militarists were able to get ratification of the Axis pact, which of course Hitler then proceeded to upset tokyo with not telling them about barbarossa).
Here, the pacific war happens much like IRL, yes. Why? Because without Pearl the US doesn't enter the European war. Hitler declaring war in support of japan (even though he wasn't legally obligated to do so, Japan was the belligerent power) gave FDR the legal, and political capital necessary to enter the war in Europe and discretion to pursue a Germany First strategy with Great Britain. Roosevelt cannot readily maneuver the US into war even though he had been attempting to bait Japan into giving him a cassus belli he could use (and an even more aggressive feasure of that was used with the Coast Guard and Navy feeding German Uboat data to the RN and in one case outright ramming a Uboat) so by '42 the US goes into the war on schedule with Pearl, but without it Japan either waits (again Yamamoto favored naval arms control treaties and the ratio because that benefitted the Japanese military situation and economy)
With Barbarossa Japan invading the Soviet Union has the issue of logistics the rebuilding and expansion of the Trans Siberian here , in this timeline, only really goes to Omsk, the USSR has lost the central Asian republics and eastern Siberia, it doesn't have a pacific port, but on the flip side that leaves Japan responsible for investment spending there and also means a larger influx of koreans and ethnic japanese but it also makes the Kwantung Army Officers look bad or at least makes them feel less prestigious without addressing the issue of Tokyo GHQ having less control over them.
So yes its not improbable to derail the pacific war by changes in Japan's up and comers but the butterfly effects internationally would have massive knock on effects globally.