We assume that for some reason the history of Japan in early XX century is different that in OTL.
Japan not invade China,and not become a militaristic/para-fascist nation,and maintains very good relations with USA and British Empire.
So december 7 1941 is a day like another in Pearl Harbour.
We assume also that in some day of 1942 United States go to war aganist nazist Germany and fascist Italy.
Without pacific front how change the the war?
Is more short?
Allied can win in 1944?