[FpUser]

I actually met couple of Vietnamese (not in Vietnam though). They were not very fond of Americans to speak softly. No real hatred either (well they're very polite and I do not really now what their actual feeling were). I do believe that modern Vietmamese people are tolerant and welcomed to a tourists including the Americans. Tourists are income and people that actually did suffer war effect and immediate aftermath are mostly dead now.

Also the US did not bring "the piece and prosperity" to Vietnam unless you mean withdrawing from that murderous war that they started in a first place. What brought a relative prosperity was that their communist government did soften their stance towards market based economy. And feeling some guilt US probably contributed few pesos.