[PapaBear3625]

imagines an alternate history in which Africa is the dominant colonizing civilization and slaves are of European descent.

That actually did happen over the period from the 8th Century through the 18th Century, as North African Muslims (the Barbary Pirates and others) conducted slave raids all along the northern Mediterranean, with around a million Europeans captured and enslaved

Now, if the Game of Thrones writers wanted to deal with REAL history, they could have a series about African Muslim slave raiders and their white slaves. But that would be too politically incorrect.

[Titus-Maximus]

Muslims had been pulling about a thousand slaves a month out of Africa for about a thousand years. Males would be castrated. Females were sex slaves. Many marched across the Sahara where 90% slave losses ocurred. They left them as they dropped.
African slaves were sold to China from the east coast of Africa.

[ExTxMarine]

Now, if the Game of Thrones writers wanted to deal with REAL history, they could have a series about African Muslim slave raiders and their white slaves

What an asinine statement! Whites were never slaves!

/s

[Jeff Chandler]

I recall Mary Shelly mentioning the problem in her novel, Frankenstein.