Different order of events in WW II

IOTL Germany started World War II by invading Poland in 1939. Japan entered in it by attacking Pearl Harbor in 1941. But what if the order was different?

Suppose Japan decides or prepares faster to attack the States and Hitler decides they need some more time to attack Poland.

So we could have Japan Attacking Pearl Harbor in 1939 and Germany attacking Poland in 1941...
 
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