Answer:
After American forces left Vietnam in 1973, the North Vietnamese defeated the South Vietnamese, uniting Vietnam into one Communist country.
Step-by-step explanation:
The Vietnam War was fought between South Vietnam, supported by the United States and North Vietnam, supported by the Soviet Union and China. The war followed the First Indochina War and lasted from November 1, 1955 to April 30, 1975. The battle took place mainly in Vietnam, although there was also fighting in the border areas of Laos (Lao Civil War) and Cambodia (Cambodian Civil War). Despite the deployment of hundreds of thousands of men, large-scale bombing, the use of chemical agents such as Agent Orange and Napalm, the United States lost this war, and Vietnam was unified under a Communist regime.