.....be a part of, and then we gave each group their own region, centered each region in an area where the people of each group were most prevalent, determined the size of each area according to the number of people included within it (more area for more people), passed two laws that apply to every person on Earth: one of those laws being the right to leave, at any time, that society of which they have been a part, and join any society which agrees to accept them: the other of those laws being the right to accurate information about the conditions in each region's society. All other laws would be regional, and would apply, and be determined, within each society.
I know the first thing that will come to many minds: this plan would be impossible to implement. I tend to agree. But suppose, for the sake of discussion, that it could be done. What would it look like at it's inception, and what would be some of the dynamics of it's interactions and evolution? Do you think anybody would like to see this happen? People that don't want to associate with any but their own race/religion/orientation/party could have their own exclusive community of like-minded people. People that want to be a part of a diverse society could choose to do so.