I don't know if Italy participated in any of those wars, but the U.S. has, and the U.S. has bases in Italy.
I remember an argument I had with someone from Germany, who was complaining about U.S. military bases in his country. I don't know if he actually used the word "imperialism," but I've sensed a good deal of resentment from Europeans over the perceived US hegemony over their continent (at least the Western half). France, for example, didn't allow US bases anymore, and they also severely limited their involvement within NATO. Western European nations didn't want to be considered satellites of the US any more than the Eastern European nations wanted to be satellites of the USSR. I've even talked to people from the UK who seem to be resentful of the US.
What I've told all of them is, "Look, if you don't like the US military being in your country, then tell your own government to kick us out." There are many Americans who don't like the idea of having troops all over the world, but the reason most accept the idea is because they believe the U.S. government when it says that the European nations want us there and need us to remain. It's treated more as an obligation - something we don't want to do, but we do it out of a sense of obligation to the world. Personally, I think it's a load of BS, but that's what our government tells us, and it's why Americans go along with it.
I just wish that Europeans would make it clear in no uncertain terms: "Yankee go home!" That way, at least our government can't get away with lying about it, and it might help change public opinion in the U.S.