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Assume US intelligence presents clear warning of the North Korean intent to attack& the US leaders take this seriously. This leads to a defeat of the NKPA near the border & its near destruction by September. The ROK/US forces never retreat south past Osan. I'm not proposing a curb stomp by uber UN forces, but still a decisive defeat of the NKPA in a necessarily bloodily campaign.
How much longer is the war in Korea likely to last & what are the knock on effects for the Cold war?