Well, there are probably many reasons why the Americans did not prevail in Vietnam.
The basic truth is that the Americans were fighting a determined, capable enemy, who were on their home turf, and who were able to keep themselves well supplied and use tactics which made it hard for the Americans to bring their air power to bear. This meant that for much of the time it was infantry soldier against infantry soldier: and when it comes down to that, always bet on the home team (as we British learned in the Revolutionary War).
What is also true is that the Americans won almost every pitched battle they fought - the Viet Cong (FLN) and North Vietnamese Army (NVA) forces suffered huge casualties during the war. But because the FLN was able to command widespread active and passive support from the local population in the disputed areas, it meant the Americans struggled to hold the ground they had won and there were always more recruits for the locals' cause. Again, another echo of the Revolutionary War.
Most important of all, though, was that the Americans were fighting a bigger war, of which Vietnam was only a part. Bombing the North would have brought China into the war alongside the NVA, whereas putting in too many reinforcements would have depleted the divisions facing the Russians in Europe. The home front was divided, in part due to resistance to the war itself, but also because of the awakening Civil Rights movements, and its Women's Rights counterpart. American attention was often elsewhere, whereas for the Vietnamese, it never was.
Still, from an American perspective, the sacrifice of so many in Vietnam was not useless. After Vietnam, there were no further significant Communist insurgencies in the region - the "dominos" that started falling with Korea came to a stop. China and Russia never engaged American forces openly. Japan and Germany stayed pro-Western. Not long after the Vietnam war finished, America moved into a long period of increasing wealth and improved social justice, which has not yet ended despite a few bumps in the road.
There are many reasons why the Americans should be proud of the way their forces fought in Vietnam, and the freedoms that were won because of it. Much of the good things in todays world were shaped in places like Ia Drang or Dong Ha - and the men who fought there were heroes indeed.
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