Technically speaking any country could launch a crypto-currency. In a lot of developing countries it would be a good idea to adopt an existing one or develop a new one. Big cost savings and they would be ahead of the curve technologically speaking. Would be cool to have US Coin or Canada Coin for us North Americans. Realistically I see it being like a dollar, and then a bunch of cournties would make their own varient of that coin zonally. Not that it makes a lot of difference, but hey, thats the way they like to operate.