The document summarizes key events in the Vietnam War between 1954-1975. It describes how the war pitted North Vietnam and communist allies against South Vietnam and its ally the United States. Serious peace negotiations began in 1968 under President Johnson and expanded in 1969 to include all parties. However, by 1975 South Vietnam's requests for aid were denied by Congress and its forces collapsed as North Vietnamese troops advanced and took Saigon. The United States had begun supporting South Vietnam militarily in 1961.