Answer:
The domino theory was the basis for the United States strategy of containment and the reason for entering the Vietnam War. The Vietnam War was a result of the national strategy of containment. The national strategy of containment demanded the U.S. stop communist aggression into the countries of Southeast Asia.Many similarities exist between the Korean and Vietnam Wars. The main reason America fought each of these wars was to keep independent nations from succumbing to communist control. ... Another similarity between Vietnam and Korea is that each of these nations became split between the communist north and democratic south.The South Korean government, under the administration of Park Chung-hee, took an active role in the Vietnam War. From September 1964 to March 1973, South Korea sent some 350,000 troops to South Vietnam. The South Korean Army, Marine Corps, Navy, and Air Force all participated as an ally of the United States.