content: Well put. I agree. And looking at nature it is the same. A school of the same fish swim together, and a pride of Lions all are banded together in likeness with one another. Certainly zoos have different areas for the logical reason that all the animals can't live peacefully together without boarders, the same with humans. We have tribes of people and even the Bible had 12 tribes all with different names and different qualities, but we see again a clear distinction between people who identity with said tribe. It's not really all that hard is it, for people to understand a unit of people or a  will for their tribe to stay preserved? Of diversity worked so well, why was everything relatively the same ethnographic until this diversity is strength lie was pushed? Anyway, great comment.