Ow can we explain Americas involvement in the Vietnam War. To what extent did America get it wrong, terribly wrong?

The quote Wrong terribly wrongis from Mcnamaras book so that is main critical analysis.

Please talk about when the amercians got involved with the war which i believe was when they supported the french in their war. Also talk about the mistakes the americans made mainly the assisnation of Diem and the fact they ignored the anti war movement and public opinion and that the US misjudged their their opponents. Please discuss the monolithic communism also.
MHRA SystemFootnotes and bibliography.

Buttinger, Joseph. Vietnam: A Political History. London: Andre Deutsch Ltd, 1969.

Garofano, John. Tragedy or Choice in Vietnam?International Security, Vol 26, No4, 2002: 143-168.

Kaiser, David. American Tragedy: Kennedy, Johnson, and the origins of the Vietnam War. Cambridge: Harvard University Press, 2000.

Karnow, Stanley. The Vietnam Debacle. April 27, 2000. 27/revisionists (accessed March 1, 2008).

Logevall, Fredrik. Choosing War: The last chance for peace and the escalation of War in Vietnam. London: Univesity of California Press Ltd, 2001.

McNamra, Robert S. In Retrospect: The Tragedy and Lessons of Vietnam. New York: Times Books, 1995.

Moyar, M. Triumph Forsaken: The Vietnam war, 1954-1965. Cambridge: Cambridge University Press, 2006.

Schlesinger Jr, Arthur M. The Bitter Heritage: Vietnam and American Diplomacy, 1941-1966. Boston: Houghton Mifflin, 1966.

Vandemark, Brian. Into the Quagmire: Lyndon Johnson and the Escalation of the Vietnam War. Oxford: Oxford University Press, 1995.