Obviously, there are assertive, independant minded women in every country, but obviously there are diferently some more than others.
As far as stereotypes go, women from Far Eastern countries are usually considered the most submissive in as much as they have a significantly reduced chance of better jobs in the work place and in a relationship are generally expected to just do what their husband/boyfriend tells them with limited say otherwise.
So yes, which country would you say has the most assertive, independant minded women?
America, as many others have said. Quite simply, a lot of men over there are tired of their crappy attitudes and would rather seek foreign women to marry. Basically, a lot of the women over there think they're the ****, and they expect a lot. Too high maintenance. For those from middle class (and higher) families anyway.