No. We did not win Vietnam or Korea. Those were utter failures that should have never happened.
And with WWII, I would like to think that we helped win the war but we were only in the war for like 5 months tops. I like to think that we gave our allies little extra push. But we did help supply you guys with weapons and ammo
But yes, we have a very conceited and egotistical outlook on ourselves that is quite...dangerous at times.
I've been to China, Thailand, Northern Ireland, and Scotland. Every time I tell people this they ask one of two questions: 1) You went overseas? How did you not get killed/kidnapped/r@ped being an American or 2) I'm so glad your safe. Did you even tell people you were an American?
I seriously want to face palm when people ask me this. I usually respond with: We are not that fricking special and people tend to not care if I'm an American. xD