Given that your written English is pretty good, Im going to have to assume that your unwarrented rudeness is intentional. So I would politely ask you to cut it out and stop being a twat, there was no need for your 'complaining' comment.
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Onto your 'point'...why should such things be left to the modders? Given how even a relatively small mod can take a) a long time to produce and b) even longer to test properly, Im going to assume you have never actually contributed to a mod, let alone made a whole one yourself. If you had, I doubt you would come out with such comments.
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People keep banging on and on with this 'its better they make 1 scenario perfect, it will be faster, more features etc etc etc' but given the choice between 1 scenario 90% complete on release or having 2 at 80% complete on release, I'll take the latter.
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It was meant to be blunt, perhaps, but not rude. Certainly not rude enough to deserve this reaction. I indeed haven't done any modding, but I do understand and appreciate the effort involved. The point was that if there is such a vocal and active portion of the community that really wants and ACW scenario, it is possible to make one, and I would be surprised if there isn't one within a year from release. And frankly, that's not a long wait at all, judging by how long PI games have active communities and players.
I guess the major issue is that I'd much rather take 1 scenario 90% complete on release, given the two choices above. I don't really care that much about the ACW, I play the game as a global one, and almost never venture into North American territory at all.
I don't think it is absurd to be able to start on any date, if we had the data set for 1836 and 1936, the population of the years in-between could just be the defined by the change in population composition between 1836 and 1936 being spread over the 100 years, and the same for pop growth. Possibly not enough to make it worth to be included, but is still far more feasible than having to research the population composition of 100 different years.
Are you suggesting it'd just be a function of starting population, end population, then interpolating between the two? Because that would be an extremely crude model of all the immigration, emigration and colonisation that went on over those 100 years. And even then, this approach would still require researching the 1936 situation, for practically no game use, since you can't play onwards from that date anyway.
Edit: Just realised the easiest way to make a basic ACW scenario, one that should be doable within a day or so. Play the game as USA (or eg. Mexico, and try to keep the US borders historical) until 1861 comes around and the south secedes, then upload the save game. You can fiddle around a few times to get it more historical.