@Ceili,
With all due respect Ceili, you've made several sharp comments about the US being late to join in. Maybe they don't represent resentment on your part, but I don't know how you can fault anyone for arriving at that conclusion. And it appears clear from his comments that spendius has an issue with the timing of US entry into the war.
If as you suggest the resentment actually flows from the perception that Americans believe (and, more precisely, voice that belief) that the US, alone, won the war, that's understandable.
It's difficult to be certain about any alternative historical scenario but I think it’s safe to say that without the US fighting against Germany (and, let's not forget, simultaneously fighting against Japan) Hitler may well have conquered all of Europe and Russia as well, and so, to a large degree, it's accurate to say that the US
saved the day.
However it would be flat out erroneous (not to mention offensive) to suggest that the contributions of the Allies towards defeating Germany were not, indeed, significant. It's also far less certain that in an alternative historical scenario, the US alone could have defeated Germany, while simultaneously being at war with Japan.
In any case, the facts are what they are and it is churlish for either "side" to diminish the contributions of the other.
Personally, I don't have a sense that any of the Allied nations have been ingrates relative to US contributions in WWII...except, of course, the French.
I think that for some Americans there is a sense that Europe should be more grateful to the United States, not simply because of any notion that
we won the war, but because of a belief that we didn't have to fight in it; even after Germany declared war on us.
If we were discussing WWI, I would very much agree, but not as far as WWII.
Obviously, US interests would have been impacted by a Europe controlled by the Nazis, but not, I believe, to the extent that we needed to go to war with them. However, it was very unlikely that having conquered all of Europe and Russia, the Nazis would have been content to simply maintain that empire. I don't think it took oracles to see that eventually the Nazis and the US would become militarily entangled, and so it was certainly in our interests to meet them in Europe (with allies) before they could consolidate enormous power and butt heads with us in Canada or Mexico.
So we joined the Allies and fought and defeated Germany. It's the closest thing to a Good War I know and we should all be happy for the outcome and grateful for one another's contributions, while reserving our disdain for France, Italy, Spain and, to a lesser degree, Switzerland.
Whether the "Free World" is sufficiently grateful to us as respects the Cold War is another story.