Traditional african marriage is an advantageous to men only not women

In which country?

http://en.wikipedia.org/wiki/List_of_African_countries_by_population

Or which culture?
http://www.google.com/search?q=african+cultures&oq=african+cultures&aqs=chrome..69i57j0l5.4665j0j7&sourceid=chrome&es_sm=119&ie=UTF-8

Why or why not?