You're wasting my time kid. How did the US military that was at the Yalu river go all the way back to Seoul? Was it magic?
We whooped your arse boy, our military was exhausted fighting the Japanese and Chinese nationalists and even with the limited resources we had compared to the US military, we still managed to kick the US military out of North Korea.
You had North Korea under control until we entered the war. Once we entered the war, the US military got the worst hiding in its history. Don't believe me? Just go ask the 8th army of the US military. They will tell ya.