>>511131539
Fun idea.
I'd strictly divide the planet geographically, among the 5 major races, even longitudinal lines. This assumes each sector will have roughly equal amounts of water, land, resources, and temperature variance. From north to south poles, each race gets strictly equal amounts of the planet to work with:

Caucasian (Europe, North America, Australia) - Light to olive skin, various hair and eye colors
Amerindian (Americas) - Light brown to red-brown skin, straight black hair, high cheekbones
Mongoloid (Asia, the Arctic, the Americas) - Yellow to brown skin, straight black hair, epicanthic eye fold
Negroid (Africa, Americas, Caribbean) - Dark skin, coiled hair, wide noses
Australoid (Australia, New Guinea, South Asia) - Dark brown to black skin, wavy to curly hair

Sectors will adhere to strict travel and immigration rules, and statistics around the topic will be heavily monitored and enforced. Races are allowed to be freely proud of who they are and stick to their own kind, while not being totally cut off from one another.

Every year, there will be an Olympics style conference to primarily determine who's enhancing the planet and who's fucking up the planet the most. Criteria for this will be strictly mathematical and unbound by emotion, straight-up Vulcan. This prevents any "oy vey logic" when it comes to settlement and population replacement. It will also prove whether or not race is directly tied to progress and historical skeletons (no race guilt or centuries-old slavery arguments). Haven't figured out what happens to the winners, losers, and in betweeners of this conference. Don't wanna award planet rulership, and don't want to genocide people without a chance to improve.

Alternatively, implement some G Gundam style tournament with racist-looking mobile suits to decide who's da best.