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.
Dispatched labor out of 10 laborers were hired by dispatched work agencies. In addition, according to the statistics of America Staffing Association, 90% of American enterprises used the services provided from labor dispatching industry. This illustrated how ingrained the concept of labor dispatching had become in American society. In Japan, since making the law of labor dispatching in 1985, labor dispatching developed rapidly, leading to the development of 615 general dispatched work agencies, 3,266 specific dispatched work agencies, and 1.4 billion dispatched laborers. As of 1998, there were 3026 general dispatched work agencies, 6985 specific dispatched work agencies, and 9 billion dispatched