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.
Japanese people in Vietnam to Vietnam. During World War II, on September 22, 1940, Japan invaded Vietnam and began constructing military bases to strike against the Allies in Southeast Asia. Japanese troops remained in Vietnam until their surrender to the Allies in 1945. Some Japanese troops from the IJA stayed in Vietnam and were recruited into the ranks of the Viet Minh as NCO's and Officers were needed to train the Viet Minh in modern tactics. Some also simply assimilated and adopted Vietnamese names, as they had Vietnamese wives and girlfriends. In recent years, many natives of Japan have migrated to Vietnam, mostly to