Final answer:
The United States alone sent troops to help South Korea in 1950.
Step-by-step explanation:
Who sent troops to help South Korea in 1950?
The correct answer is The United States alone. The United States was the country that sent troops to help South Korea when they were invaded by North Korea in the Korean War. The United States acted in support of the United Nations and led the international coalition against North Korea.
Learn more about The United States involvement in the Korean War