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I was reading this question last night about people of colour in fantasy stories. I've read so many fantasy stories where any mention of colour is associated with the negative/animalistic/barbaric that I had long decided to include all types of colour in my story (and try to avoid the stereotype, 'black man - bad!'). The way they described how their races came about got me thinking how my story world's different ethnic-groups* would 'survive' over a period of 2000-3000 years without 'dilution'.

*For this purpose I'm using ethnic-group to mean people who share a similar physical appearance; so ethno-racial rather than religious or lingual ethnic-groups.

Edit to those who may wish to downvote because I'm asking how to keep my races 'separate'. I'm not at all worried about explaining people of colour to my readers. If they can't accept that, they can go read another book. Maybe it will have lots of pictures and big writing. What my question is about, is how to retain distinct physically different looking groups, until my main story begins; 2000-3000 years after my world's history begins. No use, trying to have black, Indian, Asian, Mediterranean, and /or pasty white folk arrive on planet only for them to have all lived happily ever after before my actual story begins. I want to throw race in people's faces. I want to make them see, everyone is the same, I want them to root for the 'other'. Can't have that if everyone is already caramel.Edit sorry, rant over....

In the linked example above, the backstory was that the world was created and the gods put everyone on the world about 6000 years ago as separate racial groups. No evolution, I think DNA didn't even exist!

In my backstory, I have a similar setup where everyone is placed on a planet and then the story evolves. I don't have any gods/magic doing the placement though, normal genetics and evolution still apply. In my setting an entire planet was being evacuated, sort of a Dunkirk sort of scene where everyone is helping out with all shapes and sizes of spacecraft; this way I can get many different ethnic groups for my story. There is an accident and several ships are transported to another location and cut off from the main civilisation for thousands of years. I had already established that I wanted people of different colours and cultures to have to work together to survive. But at the same time to retain some ethnic individuality. Especially as most of my story is actually set a long time after their arrival on the planet.

This question about the minimum number of people needed for a sustainable colony is very useful, as well as this one about repopulating the earth after an apocolypse. However that is all about cross breeding and sharing genetic material to avoid inbreeding. In my mind that means mixing and balancing features out until everyone is somewhat 'similar' in appearance. So if you start with some really pasty folks and some really dark folks, over time you will end up with some really mixed folks with very few retaining the original physically distinct appearances of their forebears!

To avoid this I gave my different groups, different areas of the new planet to colonise; based on who were on the different ships, and where those ships ended up landing/crash-landing on the new planet. Mostly on the same continent. A lucky few land in the Hawaiian Islands equivalent (and are unfortunately isolated for much of my story). So they are not so much working together to survive but rather as several distinct groups working to survive separately, with some trade between them. I don't want them completely isolated from each other, frequent interaction will occur over the years. This will obviously lead to some racial conflicts when they do interact with each other (which will essentially revolve around who controls what resources). Which is fine, from a story telling conflict creation point of view but completely wrong ethically :)

To keep my groups, or at least a portion of them, distinct enough from the others over a period of time, they would have to develop some taboos about intermarriage and mixed-race children. But at the same time I do want and need mixed relationships to happen. Frequently enough that the children of such relationships are not considered 'too much' of an odd/unique curiosity. How strict/lax must their taboos about mixed marriages/relationships be? I don't want to start a war because Desdemona decided to run off with Othello!

While in real life this hasn't been a problem over the last 2000-3000 years, we still have plenty of pasty white folk and plenty of dark skinned folk with a fair few mixed folk walking around. But this new world would be a different scenario with a limited number of people at the origin point. Integration is more likely to happen as people work together/fight each other for resources.

So I believe my question is twofold:

How do I keep my different groups physical appearances distinct enough over a time span of 2000-3000 years? (without creating extreme widespread racism; there can be a few rednecks...but I would prefer not too many Trumps)

AND

How large a population of each ethnicity would be needed to avoid 'dilution' while staying genetically viable?

Or have I covered everything already and I have nothing to worry about; do I just take the minimum viable population and multiply it by how ever many ethnic groups I want?

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  • $\begingroup$ You are more worried about in-planet mixing than inter-planet one? Answer that covers one planet would help? $\endgroup$ – Mołot Aug 14 '16 at 18:08
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    $\begingroup$ Completely in-planet. No contact with the rest of the galaxy for the scope of this question. $\endgroup$ – EveryBitHelps Aug 14 '16 at 18:10
  • $\begingroup$ It would be helpful if the downvoter could why? $\endgroup$ – EveryBitHelps Aug 15 '16 at 21:20
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    $\begingroup$ What do you want from answers, beyond "well, it has happened on Earth, why wouldn't it happen on a random other planet?" $\endgroup$ – Dewi Morgan Nov 19 '18 at 19:52
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    $\begingroup$ Note that for high enough tech levels, skin color is merely a cosmetic triviality that you can change on a whim: black today, green tomorrow, white on Wednesday, transparent for the weekend. $\endgroup$ – Dewi Morgan Nov 19 '18 at 19:53
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1) Taboo on intermarriage based on different religion. Very effective, think about Jews. Actually based on caste / nationality may also work, think about Roma (Gypsies) they tend to adopt local religion, but still are disgussed by idea of intermarring with local population.

2) Make really unprofitable to leave the landing place. Ex. the nuclear core of ship still works and provides effectively free electricity in huge quantity for centuries. It would keep population dispered. If they are any prefabricated factories/hydroponic plants on the ships make them constructed soon, with no coordination with other groups.

3) Provide political division. Just separate and uncooperative local governments what makes everything harder. Boost it by language problems.

4) Geographical bariers. Deserts, mountains, huge distances...

5) Designer babies / artificial insemination. Lot's of fun: -the race of ones kids would be actually determined by asthetic preferences, not necessary by genes of parents. (there is no need for racial supremacists, when all you need is parents who think blond hair and blue eyes are cute) -solves problem of inbreeding, if you one is somewhat unlucky only gamets of one ethnic group are present on the ship. (not necessary fitting outlook of parents)

6) Make resources locally abundant while transport cost high.

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    $\begingroup$ +1 for #2. Great idea and it makes segregation a side-effect rather than a deliberate decision by the founders. $\endgroup$ – Henry Taylor Aug 15 '16 at 15:29
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One way is: simply make travel long, difficult and expensive - and only ease it "recently".

That way, only the richest, or most risky, would do it. And they don't produce many children.

They may suddenly find out that planet they are on has no oil, no coal, no radioactive isotopes suitable for their technology, and limit all power to agriculture. After few hundred years everything on another continents would be legends.

You may make oceanic weather way too hard to cross.

Either way, after some centuries they wouldn't have a common language. They would look different. They will share memory of international, multicultural past, but that's it. Language barrier might be the best barrier you can get.


Other way to go, would be to mix groups like Orthodox Jews, Muslims and Rastafari. Different beliefs, different, but deeply rooted taboos, some hatred. Common fight for survival would smooth some edges all right.

Food taboos, made stronger by what you can get on your side of planet, are very good against mixing nations. Jews have distinct genetics - it seems it worked for them for millennia all right.


TL;DR it's either geography + lack of technology, or religion. That's what worked on good old Earth.

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    $\begingroup$ They do have a stretch of desert sand that is infested with flesh eating mistraille separating the two main groups. I was going to let them communicate/travel over the neighbouring sea and thin rocky strip...but I can make it a little more tricky for them :) $\endgroup$ – EveryBitHelps Aug 14 '16 at 18:54
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    $\begingroup$ By all means let them communicate and travel. We Europeans had our ways to communicate with China for centuries. Letters and caravans. Silk Road. Only, of course, it was limited, slow, and expensive. And that's pretty much the point. $\endgroup$ – Mołot Aug 14 '16 at 18:59
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Strongly diverging language. If your nations have extreme differences in language, then communication will make it extremely hard for any person from one distinct group to integrate (marry) into another simply because they lack the means to communicate with them.

Some ideas:

  • Tonals. If you are not born into a tonal language, it's very hard to pick out the subtleties here
  • Clicks. Tongue and throat clicks can be produced that are very hard for a non-native speaker to reproduce
  • Hand / visual cues. The difference in a statement vs a question could simply be the way a persons right hand is being held at. An integration between sign language and verbal language
  • Consonant cluster f's. My screen name is a good example, the pronunciation of twelftheds is a tongue twister in a more literal sense and it takes a native speaker used to the tongue motions to get that out.

Basing each language on it's own distinct alphabet would also badly hinder communication.

As technology advances, these differences can be overcome, but early on this can completely inhibit cultures/peoples from integrating.

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  • $\begingroup$ I was going to have everyone speak a 'common' spacetrading language, and then have the languages diverge from that. So tonals, while great, wouldn't work too much in this case. But I can definitely incorporate some sign language in one of them. On the other hand, some of spacetrading people's do have their own languages as well as common. Hmm. Something to think about. Thanks! $\endgroup$ – EveryBitHelps Aug 16 '16 at 7:39

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