Let me toss in another, more unlikely, scenario:
What if Germany declare war on Japan after Pearl Harbor?
And why not?:
- Japan won't attack USSR any time soon, Even Richard Sorge, the soviet spy knew it from German sources in Japan. In fact, Japan was appeasing the Russians so they can deploy their resources against the US.
- No new front open, not a single German soldier will be diverted to face Japan.
- No lost opportunities, there wasn't much the Germans can take from America (yet).
- There isn't much a potential Japanese victory can give Germany, even in the unlikely event of Japan achieving a favorable settlement with the US (Even Japan did not dream off complete victory over the US)
And most importantly:
- Help Nazi sympathizers in US to make their case.
- It makes it very hard for American public opinion at the time to support a war against Germany, a co-belligerent at the very least.
Sure Japan had an pact with Germany at the time, but so did the Soviet Union a mere few months earlier.
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