Why do you think the U. S. originally didn’t commit ground troops to the war in the korean peninsula

"He initially refrained from committing ground forces after being advised that North Koreans could be stopped solely by America's superior air and naval power."

Explanation:

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.