This is a bet between me and a friend.
He believes that minority means a smaller number of people, which would be the result of their oppression or different treatment. So he does not believe that women in America are a minority and he does not believe that Blacks in South Africa are a minority.
I believe that minority can also mean a group of people that are not the dominate group in a country no matter the size. So women could be considered a minority in America and in South Africa, black people could be considered a minority since their group is not dominate.
Who would be more right?