Here's a good one - convince the Japanese to go after the Russians instead of the attack on Pearl Harbor.
But they did - see here: Battles of Khalkhin Gol - Wikipedia, the free encyclopedia
- and Zhukov totally trashed the Japanese 6th army. It was this defeat that persuaded the Japanese high command to focus on Pacific expansion rather than fighting a land war in Asia.
Changing this would require (a) assassinate Zhukov, fairly simple and (b) the Japanese would need good tanks! The latter seems a lot harder to me, but doable - they had good planes after all. Get them the plans for the Soviet T34 and get them to focus on tank production for several years before the war. They also need a better military doctrine focused on massive application of force to achieve a decisive result, similar to the US Grant Doctrine/Soviet Zhukov Doctrine. Germam style stormtroop tactics/Blitzkrieg/maneuver warfare/3rd generation warfare is even more effective, but relies on a highly professional, highly trained army down to the individual soldier level, with a really good non-commissioned officer corps. The Grant/Zhukov approach is far less demanding and can be equally effective.
Edit: As far as easy & sweeping changes to make go, killing Zhukov would seem likely to be the one that would have the biggest single effect on WW2, probably more than Churchill, Hitler, Stalin or Rommel.
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