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Probably heaps of reasons but a few could be
1. US were unable to fight "a total war" ie bomb the business out of North Vietnam due to political reasons at the time.
2. US were continually trying to prop up corrupt governments in South Vietnam.
3. Too many US soldiers were draftees. More specialized troops needed.
4. Drugs were rife amongst many of the US soldiers.
5. Domestic support for the war collapsed.
6. North Vietnamese were bloody good fighters.
7. US soldiers found it extremely difficult to know who the enemy was amongst the general Vietnamese population ( a little like Iraq for that matter)
8. Viet Cong were extremely difficult to track down and were getting plenty of local support.
and we could go on.
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