From America?? so does that mean if you were born in USA but moved to like...hong kong and technically are...hongkongian??..then you can join??
kinda like what hauke said, if he was born in germany but moved to USA could he join? and how are you gonna tell if they are from USA or not, lotta people around the work speak english, probably better than some people actually living here...you prolly should just open it to everyone