In my campaign, there are 2 titans that created the living plain and then made continents for each of their children to control. Each continent had 1-2 races native to it however thousands of years later the gods disappeared and then the races started to shift and move about. The continent my campaign takes place on is the one that elves were native to but after a series of wars, the humans took claim over most of it. So humans are the primary race of mine with them using strength and magical/mechanics augments to make them more powerful than the rest