If you ever see one for real, you will never forget it. You don't just see it with your eyes but you feel it and you know instantly that it does not belong here. Kinda of like walking in the woods and coming face to face with a wild animal, you know instantly that you are invading the animal's space.
It doesn't just happen in the USA, it is all over the world. I do think they go where they see the most technology. So many sightings happen around military bases.
UFOs have been sited all over the world for a very long time. Certain government entities in the US do play them down but only because they have been told to do so as per a presidential order from back in the late 40's. No one in the government, military or their organizations knows why this mandate was made other than it was important.
The government has in their possession, 3 of these ships that I know of, the small one from Roswell and two more, another small one from the same general area, and a larger one that crashed and burned just over the border in Mexico. Even so, they do not understand the Technology they possess. And while these ships and their Technology are in fact unfamiliar to anyone known on the earth, it is not extraterrestrial but of this earth.
Everything you see in movies and on TV is all crap and speculation.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.