It has been changing though, the tribes have been expanding.
All change has a backlash, backlash just shows that change is happening. We used to live in little villages, then city states, then nations, pretty soon we'll have no borders.
If you talk to people you realise that we're all the same, interacting and communicating decreases borders.
If you think we have no borders, you are either stupid or very very naive.
We are certainly not the same.