Thought experiment: In the next 50-100 years, space-related technology advances to the point where it is relatively cheap to explore or colonize space. There are Earth-to-orbit beanstalks, L5 colonies, and fusion-ramjet ships that can reach the nearer star systems at relativistic speeds while colonists wait in coldsleep. And it turns out there are ways to explore the resources of space and a lot of money to be made, so people are going into space for all kinds of reasons. Most human presence in space, at first, would be directly involved in industry or science. But any group with the relative resources of the Mayflower pilgrims can found its own colony, on the Moon, in a floating habitat, or on an extrasolar planet with Earthlike environment, if any exist nearby. Perhaps even on a terraformed Mars or Venus. The first stages of a Human Diaspora.
What kind of society(ies) and culture(s) would develop in space? Would most colonies be founded by nation-states, and remain under their political or economic control? Or by the UN, and be of mixed nationality by policy? Would religious or political sects found their own colonies? Imagine a space colony, far removed and insulated from outside influences, founded by Scientologists, or by white (or other race) separatists, by North Korean Communists, fundamentalist Muslims, Pentecostals, Moonies, Sedevacantist Catholics, Mormons (not to compare Mormons with the others in nuttiness, I just include them because they have a relevant history) . . .
One way this would differ from every previous wave of colonization in human history: In the first stages, all humans in space would be highly educated professionals (military personnel, engineers, scientists, technicians), and their families, with no serious physical or mental disabilities. Very clean gene pool, very low-dysfunction social group – and weighted, genetically and culturally, to whichever ethnic/racial group is most likely to produce professionals in the colonizing society. And then later standards would be relaxed, and a wider range of kinds of people would start arriving in space – but according to the “hearth culture” or “doctrine of effective first settlement” theory, the first group to effectively colonize a given region creates a local culture to which later settlers and immigrants largely adapt. And also, if you live in space, whatever kind of person you are, your life depends on very complicated technology, and people who don’t have a high level of scientific and technical sophistication don’t live long. So what kind of culture would that produce? A highly scientific, rational one? Less given to religious enthusiasm than Earthside cultures? How would that interact with a proliferation of sectarian colonies?