My novel set in the future where everything is automated and fake: lighting, air, and food are all modified or simulated, and the government controls it all. This automated world is set on a planet called Earth 9, which is not really a planet but a large space station housing 2 million people. When I was reading my first chapters draft, I was introducing my main character and I was wondering what is his race. I was thinking would there be just one race, so the government could control religion and racial ideas. That way, racial disagreements wouldn't start nor would it create a war, which in my book is the motto, “Blessed with peace of mind”. But later is found in the online database was originally “Lost With One Mind”. Could the idea of one race be possible.
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By the time we have space stations which can support 2 million people safely, the medical sciences involved in appearance alteration will give those citizen's complete control over their skin color, hair color and all other racially-linked features. Each person will be able to modify their body's outward appearance with ease, choosing to have a dark complexion today and freckles tomorrow. With such diversity at hand, the concept of race will loose all meaning.
Are all 2 million residents from a single ancestral (racial) stock? Who knows!
...and more importantly, who cares.
First, we must answer the question.
What is race?
Race is mainly a social construct sometimes based on physical characteristics such as skin color.
It really depends on what you mean. If all people have the same physical characteristics with no variation, then race is a bit erased. To give you an example, there's the Irish. We had signs that said "Irish need Not apply" back in the day, but because Irish people LOOKED a lot like the English, Dutch, and other stock, they became "White" and Irish became heritage instead of race.
So you could take this a bit further in this dystopia of yours. Not only is the environment constructed, maybe the people are as well. There may well be NO difference in facial features or skin color at all. Everyone may look exactly the same, or there 6 basic faces you are assigned.
One race is simple when all breeding is done by cloning controlled by the government. Everyone is sterile and all birth is controlled artificially.
It's another good means of control.
TL;DR -- Absolutely!
On Earth, races came about when you had populations that didn't mix much. They had enough time and isolation to diverge. In more mixed communities, over time you'll get a fair amount of intermarriage. Note I'm talking about what you might call "visual races", or if you want to be all jargony, "phenotypes".
You might speculate that over time, the races of Earth will gradually meld together into one. This could happen -- who's to say -- but that job would be much easier in a smaller community such as your space station.
It'll help if the community identity is based on language, culture, alien threats, or some other non-visual criterion.