Reasons: Following France's defeat in the French Indochina war (1946-54), Vietnam was divided into North and South Vietnam by the Geneva Conference (1954). War soon broke out in South Vietnam as Communist-led guerrillas (the Viet Cong) tried to overthrow the South Vietnamese government.Stated reasons why America went to war: - President John F. Kennedy decides to help the South Vietnamese government in its war against the Vietcong guerrillas. - The Truman administration believed that the United States and its allies must meet any sign of communist aggression must be met quickly and forcefully by the United States and its allies.Unstated reasons why America went to war:-From Washington's perspective, the principal threat to U.S. security and world peace was monolithic, dictatorial communism emanating from the Soviet Union.-Any communist anywhere, at home or abroad, was, by definition, an enemy of the United States.Participants in Vietnam War – North Vietnam supported by China and the Soviet Union and the non-Communist forces of South Vietnam supported by the United States.Outcome: 58,000 Americans die during this war. America looses this war. Vietnam became a communist country. Tremendous number of immigrants came to U.S.A. after the war. ...