The Vietnam War was the longest war in United States history. It lasted from 1957 to 1975. The U.S. got involved in this war to stop communism from spreading; first in individual countries and then hopefully in the world. Vietnam was divided along the 17th parallel. It was divided to construct a communist section in the northern part of Vietnam and a democratic section in the southern part of Vietnam. The North allied with the United States and the South allied with Australia, New Zealand, the Philippines, South Korea, and Thailand. …