I always build my campaign worlds around the characters, so the current campaign world has, in order of highest to lowest population:

Humans
Tortles
Tieflings
Halflings
Gnomes
Kenku
Goliaths
Dwarves

In general, tortles are native to the valley, humans and Halflings came later, tieflings moved in when vampires took over, gnomes are imported experts, and goliaths and dwarves are travelers from afar.

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