History of Vietnam since 1945 unstable as no government could keep power for long. There were more coups, often more than one every year. The Communist-run Viet Cong expanded their operation and scored some significant military victories during this period. In 1965, US President Lyndon Johnson sent troops to South Vietnam to secure the country and started to bomb North Vietnam, assuming that if South Vietnam fell to the Communists, other countries in the Southeast Asia would follow, in accordance with the domino theory. Other US allies, such as Australia, New Zealand, South Korea, Thailand, the Philippines, and Taiwan also sent troops to South Vietnam.
1964 in the Vietnam War Vietnam and the introduction of U.S. combat troops into South Vietnam. By year's end, the 23,000 U.S. military personnel in South Vietnam were still technically "advisers" (although they participated in many air and ground operations with the ARVN), but Johnson was contemplating U.S. ground troops. At the time, most of the reports and conversations mentioned below were secret; they were not made public for many years. U.S. Ambassador to South Vietnam Henry Cabot Lodge Jr. reported to Washington that the new President of South Vietnam Dương Văn Minh told him that he opposed American soldiers going into villages and districts