The most fundamental reason why the United States fought the Vietnam War was to prevent the North Vietnamese regime supported by the Soviet Union from reunifying Vietnam. After World War II, according to the provisions of the 1954 Geneva Conference, North Vietnam and South Vietnam will hold elections to unify the whole country in 1956. Because North Vietnam is a socialist system, in order to distribute land to the tillers, land reform was carried out in North Vietnam to distribute large areas of land to the people. This policy directly led to the panic of the South Vietnamese government at that time, thinking that under this policy of North Vietnam, it would win the votes of the South Vietnamese people in the national election and unify Vietnam. South Vietnam, which thought it was impossible to win, and South Vietnam, which was defeated by the United States under the North Vietnamese offensive, were all made by the United States.

After the end of World War II, the world pattern has become two camps headed by the United States and the Soviet Union, a capitalist country represented by the United States and a socialist country represented by the Soviet Union. Due to the national ideological opposition, the Soviet Red Army, with the cooperation of the United States and the Soviet Union, defeated Germany, not only liberated the eastern European countries, but also divided Germany into two parts. The Anglo-American allies controlled the western European countries, so the capitalist countries in western Europe controlled by the United States competed with the socialist countries in eastern Europe controlled by the Soviet Union. As a result, in the areas controlled by the two major forces of the United States and the Soviet Union, the confrontation between the two sides inevitably began and intensified.

Western European countries headed by the United States established the North Atlantic Military Treaty Organization, or NATO for short. At the same time, the socialist countries in eastern Europe, led by the Soviet Union, also established the Warsaw Military Agreement Organization, referred to as the Warsaw Pact Organization. The two sides began to confront each other. In the Asian region, the two sides are also constantly competing and restricting. As a result, the two regimes in Vietnam in Southeast Asia began to fight against each other, and the contradictions between the two sides also intensified. From19th century, Vietnam became a colony of France. In World War II, Germany defeated France, but Japan, which took advantage of the fire, occupied Vietnam. After Japan's defeat and surrender, Ho Chi Minh, a North Vietnamese, established the Democratic Republic of Vietnam in North Vietnam and went to war with the South Vietnamese regime supported by France.

The Democratic Republic of Vietnam is the first socialist country in Southeast Asia supported by the Soviet Union, so North Vietnam defeated France with the support of the Soviet Union. After France withdrew its troops from Vietnam, the South Vietnamese regime, which was taken over and controlled by the United States, finally formed the Democratic Republic of Vietnam supported by Soviet socialist countries against the Republic of Vietnam supported by American capitalist countries, and launched a confrontation in Vietnam with the support of two major forces. However, the disappointed South Vietnamese regime was unable to resist under the blow of the high morale of North Vietnam, so it was worried that the socialist reunification of Vietnam would continue to affect the investment of the whole Southeast Asia in the Oriental Group, so the United States began to intervene in 196 1, and 1965 officially invaded Vietnam and launched the Vietnam War. 1April 30, 975, the Vietnam War in which the United States participated officially ended. 1976 65438+1October 2, North Vietnam unified Vietnam, the country name: Socialist Republic of Vietnam.