Counterpart Fan Art! See this Instagram photo by @artzy_dragon instagram.com/p/Bgwud3kAcQT/?utm_source=ig_web_share
We've seen architecture differences, we've heard about The Flu, and the technology seems off, but I think the reduction in population has resulted in a wealthier and more focused government in "Dimension Two."
With that many fewer people in the world, there must be less competition for resources and less reason for conflict. Unless humans are just assholes by nature and will fight over stuff even when there's plenty of stuff to go around.