Explain 2 things to me then, 1. Why don't we have mixed races all over the earth? 2. How would you go about walking to China from Europe 1000 years ago? Think about needing to survive the winter, you need food for the trip, you don't know where water is, you can't speak any of the languages along the map, you don't have complete maps.
3. Explain why you would go on this trip several times in your life?
4. Explain why people don't have any problems with this whatsoever in a modern setting where you can travel quickly via Airplane.
Go on
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Go ahead and explain what is wrong with using the easterlings and the people of Rhun or some other established people of color instead of token characters?
There are rules if you want your series to get more than 6.2 on IMDB, house of the dragon and game of thrones both had plenty of diverse actors, all in fitting roles, and the sit way higher on IMDB