Pueblo we know wery little about
We know enough to make a civilization out of them. Most of the communities are still there (often with a large casino a few miles from the traditional pueblo). LH
Popay UB
Kiva. They were never a large civilization, but they are interesting and provide a culturally distinct alternative to the Iroquois if you want to play a Native American civ.
Why do you not think Firaxis would consider Indonesia? That kind of surprises me, especially since they did considered a far smaller (though still important) civilization, the Khmer. It's good you modded one for c4, it always seemed to be a gaping hole that civ didn't have a nation representing the 4th most populous nation and a unique culture in of itself. I would like to reiterate my point that it seems silly to have Holland without Indonesia; most Dutch territory in the colonial era was land taken from the Indonesians. It would be like having a video game with Alexander the Great but no Persians.
As for Afghanistan, well, it is arguable at least that the Soviet loss there expedited if not led to the collapse of their political system, and the
Third Battle of Panipat helped weaken the Maratha empire substantially (which almost certainly helped Britain conquer that empire).
Nor was Afghanistan ever completely a part of British India. The fact that India's UU is an ancient elephant, and that Ashoka was the co-leaderhead in civ-4, to me indicates that by "India" Firaxis means more specifically "Hindustan", which refers to the land more or less covered by modern day India. Burma was also a part of British India, but I think we would think of it as a distinct civilization (there were certainly no mughal forts in Rangoon!) The British were unable to conquer Afghanistan, and at best were only able to turn it into a puppet state.
That the British tried to lump it in with India doesn't mean that Afghanistan shouldn't be seen as a civilization all of its own. Rome and Britain both include Celtia in the sense that one of them conquered it and the other is a synthesis of Celtic culture with Germanic and Latin culture. Like the conflict between Celtic and Roman culture, it is the conflict between these two civilizations that one of the major forces in Indian history.
The objection to Cuba is understandable (I'd almost say "too small" not "too young", with a population of ~11 million and on a tiny island). But the lack of (1) a Latin American civilization and (2) a cold-war era leaderhead throughout all of the Civ games is another striking void (something which was present in all the other civ games), and Cuba seems to kill both of those birds with one stone.
Hussar-interesting video. I didn't know so much about medieval Poland, though I was aware of its multiethnic status. But by 1941, it was not difficult for the Nazis to exploit native anti-semitism in Eastern Europe, Poland included, to whip up the locals into helping them with the holocaust. I don't know if its record in this is necessarily better than various other nations, even if it portrayed a lot of tolerance and multinationalism in its early history. I'd say it deserves to be a civ, but perhaps it would be better to space out civs by region between the first and second expacs/later DLC? Like, 2 European civs in each, with more from other parts of the world? Perhaps Poland and Spain but with Holland and Celtia reserved for a 2nd expac?