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I think it also depends on what flag the Mars colony flies. If a country (e.g. the U.S) claims the colony for themselves, I think it makes sense that there will be more and more pressure to disassociate especially as people from different countries on Earth mix together. I can see a united colony, however, something like the ISS, working better as there is the cultural idea of being "for humanity" as opposed to "for this country that not everybody identifies with".