I'm not sure how this thread got to be about beautiful women since the OP seemed to be talking about the race in general - meaning both men and women. Of course, only the women on the forum are going to talk about the men - so yea.
Any way, as far as race goes there is no winner IMO. There are too many beautiful women the world over. So many things can attribute to their attractiveness, like accent and such. But if I go by countries I've been too, I have to say the US or Canada. Simply because there are beautiful women from all over the world here and in Canada, and not so much in other countries with the exception of most european countries.
The least on my list would be the asian countries. And this isn't to say I have anything against asians, as some of the women I find MOST attractive are asian of all kinds. But I base my opinion here on what I consider to be fact as well. Lets use Japan as an example, everyone there mates with other japanese people. If you think about it, everyone in Japan isolated themselves and only mate with other japanese people, so their gene pool isn't near as deep - so to speak. Taken as a whole, Japanese people have a lot of really ugly people - and its my personal belief that this is because their all pretty much related. They need to get out more.