I appologise, this is going to be a lot of cross referencing throughout ATS. I got the idea from this thread:greys In it people are talking about the physiology of the greys like they are common knowledge and it made me think: How can these abductions and grey visits be almost entirely only happen in the USofA? Please follw me here:Roswell for Dummies
What if, there was a crashed craft and the militaries experimented on them, only to be contacted, by the creators/owners/grey-people. After that, they sold out the population to these beings, for free experimentation and breeding and what not. In exchange for technology. Not too much, after all they were already in depths, or that's how an advanced not so benevolent race would have putted it.