The biggest mistake of the US was to massively cut down its army in size in the late 1940s. This is admitted in American records. The US was not expecting war to break out in the Korean region. North Korea had created a professional army with support of Soviet Union and steamrolled South Korea in 1950. The US was caught off-guard in this situation but US-led forces were able to liberate South Korea in the end.Let's also not forget that McArthur insisted the US drop a few atomic bombs on China to keep them out of the conflict,but he was replaced.
The most fascinating thing is performance of American Pershing tank in this war. This tank was built to kill German Tiger tanks and it did very well in the Korean War as well. Pershing tank smoked Soviet T-34s among others in battles. But the US did not had much time to mass produce it at the time.
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