How would a world with heavy colonization work?

[Vrock Bait]

My idea is that the “Khoirvaire” continent is basically just races in core, while other places also have races like Asherati and Nezumi. The idea of this setting was to show not everything is black and white, and that while the elf king may be kind and just to his subjects, he supports the prosperity of his nation through slavery. I do not mean to stir up controversy. There should be no reason why real-life racism is brought up. Please don’t discuss this more in this thread.