The Glock does not strike me as an American firearm,being it's from Austria
Where its manufactured has little bearing on its popularity as "America's gun" its simply one of the most popular pistols for shooting sports, self defense, police sidearms, lets face it its an iconic gun. Everyone knows Glock they know it means a pistol that is black. Is it America's Gun? perhaps not but it should not be dismissed so casually.
I don't think revolvers qualify anymore thoughts have changed in newer shooters and revolvers are 'old guns'
maybe 30 or 40 years ago that would be a different story.