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Suppose the IJA used gas against against U.S. troops in the Philippines in 1941, the U.S. responds by building up it's gas stockpile and using it in the Dolittle Raid followed by Japan launching balloons with weaponized plague-infected fleas in the West coast.
How would it effect the war in Europe? Do you believe it would increase or decrease the odds of being used in North Africa and Europe and also does it increase the chance America is forced due to political and military reasons to focus much more heavily on the Pacific?