Why did americans come to oppose the united states involvement in the vietnam war +?

Many americans opposed the war on moral grounds, appalled by the devastation and violence of the war. others claimed the conflict was a war against vietnamese independence, or an intervention in a foreign civil war; others opposed it because they felt it lacked clear objectives and appeared to be unwinnable.have a nice nighthope this

Is this a joke question or what, obviously that means red dead redemption 2!