This was a war which bankrupted the U.S. economically and spiritually. It led to the end of the Gold Standard and confirmed the standing of the Military Industrial Complex as a powerful independent and permanent feature of U.S. politics. Both parties supported the war initially, as did almost all Americans. Many Republicans, as well as Democrats, profited from war industry contributions.
Before I respond to this, let me note that, yes, Ho Chi Minh died in 1969, and General Giap was fired in 1972 after his disastrous Easter Offensive. I already corrected the date of Giap's firing, but I had forgotten that Ho died in '69.
The Vietnam War did not bankrupt the U.S. economically. Furthermore, the war would have cost much less from '64 to '68 if LBJ had not so badly mishandled it and if he had replaced Westmoreland after it became obvious that his big-battle attrition strategy was the wrong approach.
As for spiritual bankruptcy, this can hardly be blamed on our effort to keep South Vietnam free. The spiritual bankrupting was done by the news media and by feckless Democrats who, after insisting on putting handcuffs on our military, turned against the war and continued to smear the war effort even when General Abrams dramatically revamped our strategy and began to achieve significant success in securing South Vietnam and in smashing the NV from 1968 through late 1972.