i don't know about that - where are most of the bitcoins sitting? america is far ahead of the game.. and it also depends on how much overstock's business model relies on international sales vs. domestic.
I'd love to know how you came to the conclusion that most bitcoins are sitting in america, and exactly what you mean by "america is far ahead of the game". I think you'll find that the volume and magnitude of transactions in China dwarfs those in America, and that general acceptance and positive government responses to Bitcoin usage is far higher in the UK, Europe, and Australia. I'll concede that there are more vendors in America accepting it right now, and certainly the likes of Overstock are the biggest of these, but to assume that most bitcoin expenditure occurs in America and they wouldn't benefit from international sales is a little short-sighted.