I'm surprised that no one posted the possibility of Pearl Harbor not happening. If the USA doesn't take a hard line against Japan over its expansions (especially China) nor cut off certain resources, the Japanese might not feel obliged to attack. Without that impetus, there's an argument that the USA would not have entered the war.
Would the US government have been forced into war if the Japanese siezed the Dutch East Indies ? Would the yellow peril press and fears of the safety of the Phillipines been enough to make sure the US was forced to war ?
If the US is not forced into combat with the Japanese and therefore the Axis is it possible they will not fight Germany directly at all ?