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With a POD of 1944 or later, how many countries could have been divided into a communist half and a capitalist half? They have to be roughly equal sized, so PRC and Taiwan doesn't count, however an equally split China would count.
OTL examples:
North Korea and South Korea
North Vietnam and South Vietnam
West Germany and East Germany
Some possible ATL scenarios could be:
North China (PRC) and South China (ROC) after different civil war
West Austria (capitalist) and East Austria (communist) after different ending to WW2
North Japan (communist) and South Japan (capitalist) after Operation Downfall
As a further challenge, have all of these countries survive to the modern day instead of being reunited.