: This is an alternate Earth. However, the Aether is not Earth itself, although it is a generally Earthlike 'world', in the sense that the overall climate is similar, same gravity, one yellow sun, one moon, etc.
There are many, many different human races, even species. Humans are not exempt from the acceleration/augmentation of development that magic causes (although magic tends to blur the line between 'race' and 'species'). Elves, dwarves, orcs, and gargoyles are all examples of species close enough to human that they could almost be considered different races of the same species, despite physical differences. That aside, cultural and ethnic diversity amongst 'vanilla' humans exceeds that of Earth due to the sheer size of the Aether.
((BD: Lightsabers are possible without the Force, they just can't be effectively used.