We are broken into different factions at the moment, but in fact we are fast becoming a one world culture if not society.
Heavy industry. Advanced technologies, Communications, all these have spread around the globe in rapid fashion.
I think if we are to consider Mu, and Atlantis, we might consider them to be different factions of what once was a world wide culture, much as we are moving toward in our own generation.
Atlantis may have the greater notoriety, but I think they were much one and the same to a large degree.
Is there a thing of which it is said, "See, this is new?"It has been already, in the ages before us. Ecc 1: 9-10