Because public opinion shaped the conflict much more than in WWII, or even Korea, probably chiefly due to advances in communications making the conflict much more "real time."
The Vietnam War=the military draft!
The Vietnam War was the first war to be televised to the public. So America saw everything that was going on in Vietnam and wanted to pull out of the war.
Public discontent.
They were ashamed of it
The Vietnam War hurt his image.
The public was drafted, the public resisted.
With increasing dissaproval as the war dragged on.
Using the public to fight it (conscription).
Rejection from the public.
To explain the war to the public
The draft.
The Vietnam war was from 1972 to 1853, ^^^^^^^^^^^^^^^^^^^^^^^^^^^ WOW! Whoever wrote this is a dumbwad! LOL