United Korea taking parts of Manchuria during the Chinese civil war

Say all of Korea goes to the United States and it gains independence in 1948

Could a United Korea invade and take Korean parts of Manchuria during the Chinese civil war

Could they maintain it against Communist China with American Backing

500px-Ethnolinguistic_map_of_China_1983.png
 
You would need a Korea that modernizes alongside Japan and ally's with them instead of being annexed. That would allow you to possibly have a go at that.
 
In addition to what was said above, OTL's South Korean army was woefully equipped in 1950, mostly with IJA leftovers as I understand it. They'd have one hell of an uphill battle against the CCP with kit like that.
 
Could be a deal with the US and the RoC to allow Korea to keep Gamdo (most of that land) which they had gained thanks to Japan in exchange for China getting something in return (more postwar rebuilding?)

This is most likely to happen in a scenario where the Communists lose the civil war but manage to keep Manchuria. In that case, the US (and maybe even RoC) could help Korea acquire that land for good.
 
It wouldn't be out of character for the Eastern bloc if the USSR transferred the Korean speaking population in Manchuria across the border into North Korea. The Soviet used extensive postwar population transfers between Poland and the Ukrainian SSR, and expelled the Japanese who had been living in Sakhalin before 1945.
 
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