In terms of vietnam, at the start, americans were mostly neutral, didnt think strongly of it. Towards the end many americans were heavily against the war. Regardless, having a bias as I would be a child coming from families directly affected by the war, the U.S granted many people from affected countries immigration rights to come to the U.S. mainly Vietnam. Laos and Cambodia (and especially cambodia given how Polpot took it a step further in the wrong direction).