The cultural differences between UFO sightings are really interesting. If you look at sightings maps, they aggregate heavily in North America. This aligns with other paranormal experiences, ghosts as well, which is a very much more Anglo phenomenon than European one: ghost sightings rarely happen in Europe, but they happen all the time in Anglo countries. Obviously, Anglo countries are more culturally prone to "see" them - or more prone to talk about them, one of these two.