what countries was the vietnam war between?
South Vietnam Australia New Zealand North Vietnam Pathet Lao Philippines Khmer Republic United States of America Khmer Rouge North Korea Viet Cong China Thailand South Korea Kingdom of Laos Taiwan Soviet Union
entailment
 The Vietnam War , was a conflict between the Democratic Republic of Vietnam ( DRVN , or North Vietnam ) and the Republic of Vietnam ( RVN , or South Vietnam ) , which eventually involved their respective allies including the United States . 

neutral
 The conflict was part of the Second Indochina War ( 1959 – 1975 ) which also consumed the neighboring Kingdom of Laos , South Vietnam , and North Vietnam individually referred to as the Laotian Civil War and the Vietnam War respectively . The Cambodian civil war led to the Cambodian Genocide , one of the bloodiest in history . 

entailment
 The Vietnam War , was a conflict between the Democratic Republic of Vietnam ( DRVN , DRV or North Vietnam ) and the Republic of Vietnam ( RVN or South Vietnam ) , which eventually involved their respective allies . In 1959 , the United States sent military advisors to train the Army of the Republic of Vietnam . By 1965 , there were 25 @,@ 000 military advisors in South Vietnam and on March 8 , 1965 , the United States Marines became the first US combat troops to land in South Vietnam , with a force of 3 @,@ 500 . 

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 The Vietnam War ( 1955 – 1975 ) was an important issue on college campuses across the United States in the 1960s and 1970s . As a belated response to Vietnam War protesters who believed that funding from the Defense Advanced Research Projects Agency ( DARPA ) made the university part of the military – industrial complex , the Stanford Research Institute split from Stanford University in 1970 . The organization subsequently changed its name from the Stanford Research Institute to SRI International in 1977 . 

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 = = = Relations with South Vietnam ( 1959 to 1975 ) = = = 
