All three of them are here, as is Guy of Gisborne.
England, near where Camelot once stood, correct?
And yes, it's possible as I am from before that. People are brought here from all sorts of times and places. But no, the United States is part of the land North America, across the ocean from Europe.
They are supernatural beings who are both dead yet not and feed on blood to survive. Here, there are numerous types, different worlds. The FN ones, they have been causing destruction and death in their wake. We are in the process of trying to locate them and put an end to their attempts but this will keep them from being able to see anything that is said. Thankfully it seems they are unable to be out during the day so you would still be safe.
Where are you? I can bring you to the main complex if you like, it's protected from them as well as demons.