Nazis don't support Japan

Basically, Nazi Germany decides to not declare war on the USA when it goes after Japan. Would the USA have only fought Japan? Could Japan have been crushed in two years instead with the entire industrial potential focused on them instead?

Meanwhile, will the Soviet Union get all of Europe with no America to intervene?
 
Hitler might declare war on the USA at some point anyway regardless of the lack of alliance with Japan, figuring war with the Americans was inevitable so he might as well do it while he has an opportunity to take the initiative. IIRC that was his rationale in 1941.
 
In fact, the US was planning to declare war on Germany solely based on that nation's unrestricted submarine warfare, and the attack on Pearl Harbor had little bearing on that decision's outcome.
 
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