In what way?

The US nearly lost the Korean war.

The US army was nearly overrun at least once.

The US airforce never achieved air superiority, and Soviet aircraft were better in most ways.

The only undisputed advantage the US had was nukes, which is why MacArthur wanted to use them tactically (!)

There is no way we could match them in numbers on the ground. Such a conflict would have inevitably led to us nuking them as a result. Which is probably the reason decision makers chose not to.