Truman had already withdrawn US troops from S. Korea in 1949 and his Secretary of State (Acheson) said we were not interested in influencing events in the Korean peninsula any longer.
Of course, when North Korea invaded S. Korea in 1950 Truman realized the troop-withdrawal was a disastrous mistake.
Truman got the UN to agree to take charge of re-winning S. Korea's freedom.
30,000 Americans died in Korea, fighting under the UN in the remaining 30 months of Truman's presidency.
The Korean War marked the first time in history that the United Nations sent armed forces into combat to stop aggression. Armed forces and medical support units from 20 United Nations member states, along with the Republic of Korea and Italy, teamed together under the United Nations banner to halt the attempted communist takeover of the Republic of Korea.
the dumbocrats do not know the meaning of "learn from your mistakes"