It's human nature but culturally the barriers are breaking down. We've shown time and time again that culture evolves and with it so do we.
At one point it was unthinkable that people of different religions could live together or people of different colours and cultures and while it's not harmonious by any stretch of the world it's light years ahead of where it was even 50 years ago.
In Europe you had countries that have been at war for generations now part of one super nation.
The whole concept of nations is something relatively new anyway, we started off with small tribes and our tribes have gotten bigger as we've evolved. It started off as villages, then city states, then countries, then empires, now we're in a situation where multiple distinct countries and cultures fall under the umbrella of a union. It's not far out imagining that the expanding reach of the size of our "tribes" or herds could encompass all of humanity without prejudice or discrimination.
Looking back and thinking how quickly we're evolving generation to generation I'm really looking forwards to seeing what the next fifty years brings to our society.
The next step is utilising technology to have a more direct link with democracy so that we get rid of a lot of the power that we place in politicians.