re: Migrating on Earth
Good point about visiting Earth. I am mostly of European decent (With a little bit of Native American thrown in). I have never been to Europe and don’t know if I’ll ever go. I know many, many Americans of European decent who have never been to Europe.
Someone born on Mars probably couldn’t land on Earth, unless medical technology is there to adapt their body. But I don’t think that would bother moth Martians. There are plenty of other worlds they could visit if they needed to get off Mars. However, I think they will be a proud people…proud of being Martians.