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And as a follow-up, how would it have changed post-war Asia?

It occurs to me that time and manor could have made a big difference in the post-war world. Even a year earlier, and the Soviets would have been unlikely to have rush together it's end-war land grab rush. Britain holding out at Singapore and maintaining a Pacific presence would be another change.

The likely PODs seem to operate around the opening offensive, so let's try there. Rather than a streak of victories, Japan suffers a string of defeats. Radar at Pearl Harbor detects the Japanese fighters, and not only is the American fleet spared much of its damage (despite heavy causalities), but the Japanese are forced to accept the expected loss of their carriers in the bloodier battle thereafter. Britain holds outlasts the Japanese at Singapore as well. Other battles follow suit: nothing especially the Japanese's fault, but far from OTL.

How fast, and how radical the changes.
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