Similar experience/perspective as the gp. People in different places are, in many if not most cases, just fundamentally different in countless ways.
I think both genetics (personality, among endless other characteristics is significantly to majority heritable and going to have different distributions in different areas) and environment/culture play significant roles.
But an interesting thing is that by the time people are adults, perhaps even before, the environmental factors have irreversibly changed them so marginalising cultural factors as "just" environmental doesn't really paint a fair picture.
For a person who's happy to travel/live just about anywhere this makes having children doubly fun, because you basically get to decide the 'cultural mold' for your children, which is really neat!