Why do all UFO sightings toke place in the USA & UK ?

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Hey all! While watching tv,and special reports about people seeing aliens and UFOs, it occurred to me, that all those people are Americans.haven't anyone in Europe saw strange things in the sky lately? well the UK have.But why nowhere else? and is it a coincidence that all those events happened before the new millennium? Well there's 2 options to consider : 1) Aliens attempted to contact earthlings.But the UK and US governments hid those facts. I'm just assuming, i have no clue about this case. 2) Aliens did not contact human beings.But in this case why were there people acclaiming that they saw UFOs? My personal opinion in this case is that, people did see something strange in the sky but it wasn't UFOs.It was something else, maybe top secret aircrafts were being tested by the governments at that time.You know the STEALTH BOMBER aircraft we see in the news and movies? the black triangular shaped one? well imagine back in the 60's or 70's where a citizen will see one of those.Because he hasn't the knowledge, the information about the stealth aircraft, he will assume it's from outer space. As for the flying saucer case, well maybe it's an aircraft not revealed yet. Who knows? i just had this idea because of the advanced aircraft technology that the US and UK have, plus to the fact that most of the sighting that i know about toke place there. Hope you share your knowledge.