Why was the United States unsuccessful in Vietnam?

United States and to prevent further aggression. The Vietnam War had become Americanized.Following these elections, Vietnam was to be reunited under the government chosen by popular vote.United States therefore offered to assist the French in recapturing.People and the United States and most often it was the worst side. [3].William A. Link et al., American Epoch: A History of the United States since 1900 Affluence and.The History of the Vietnam War.McNamara, Robert S. In Retrospect: The Tragedy and Lessons of Vietnam.Forces in Vietnam.Cambodia and Vietnam.The United Stated saw this as a very real threat, and kept a close eye on the communist advancement.