I shouldn't reply to an obvious troll account, but just because I've seen this claim come up several times now, and because it gives me an excuse to drop some high strangeness - UFOs have been spotted all over the world. It isn't just a US thing, although one could always argue the effect of the influence of US cultural hegemony on sightings elsewhere.
They do make a decent point tho. I don't see articles in the BBC, CBC or NHK every couple months about these things, since I've been following (recent history), it's mostly been the Americans who frequently talk about/spot this stuff.
