The Vietnam war was America's failed attempt to prevent the spread of communism throughout Asia. The idea was that if one country became communist, the others would begin to fall like dominoes. It was also an attempt to prevent unrest in that part of the world.
The United States entered the Vietnam War in order to prevent Vietnam from falling to the Communists. The United States began sending France aid during the First Indochina War from 1948 – 1954 to prevent the Communists from taking control of Vietnam. When the Geneva Accords ended the First Indochina War and established two Vietnams – North and South, the US sent advisors to assist the new South Vietnam government. When Kennedy took office he supported additional assistance. Kennedy believed that if the Communists succeeded in Vietnam it would spark aggression in other parts of the world. Ultimately troops were sent as the North escalated the conflict and fears grew that the crumbling South Vietnamese government would fall to the Communist North.