If we landed men on the moon: I'm impressed and proud not only of my country but of the hundreds of immigrant and international engineers and scientists involved. It is, perhaps, the most amazing technical feat of all time.
If it's a big hoax that was initiated because of the cold war and it's been perpetuated for all these years: I'm really, really impressed and proud of my country for pulling off what is undoubtedly the most amazing technical *and* socialogical feat of all time - all for the cause of democracy. Oh, and screw those german scientists who must've been worthless or else we wouldn't of had to fake it.
Either way it's an awsome accomplishment that could only be achieved by the only true superpower (to date) - the good 'ol USA.