Let's talk about race and miscegenation in DnD settings, shall we?
I've always found it a problem how Wizards of the Coast and Paizo (and basically every other fantasy company) love to say how you can find black people in the furthest reaches of the North because travel is somehow easier and more available to Humanity in their setting, but that leaves me with a question.
Why are there still white people?
Easy travel means easy migration, and Not!Europe has always been portrayed as exceptionally fertile and rich with resources, things that people from the more wild parts of the setting (typically the Not!Africa) would desire. Considering how hyper-tolerant and inclusive these fantasy countries tend to be towards Humans of all shapes, sizes, gender orientations and creeds, wouldn't this mean over the thousands upon thousands of years they've been established, that eventually the country is going to get brown as immigrants spill into the region and intermarry among the locals? African features like dark hair, dark eyes and dark skin are, after all, very dominant genes.
You could tell me immigration doesn't do that, and you'd be right to say things like the Anglo-Saxon invasion of Britain or the Volkswanderung of the Migration Period hardly put a dent into the local ethnography, but those only took place over the course of a hundred or two hundred years, not the thousands you could see in something like Golarion or Faerun.
So... What's the deal? Why do they add black people into Not!Scandinavia without even touching on the implications such easy migration and movement would imply?