I'm not quite sure where this might fit, so, well, it'll be in Ephemera.
Mesoamerican civilization should be of great interest to conworlders, as one example of a truly alien culture, with some strange and disturbing culture, with some very familiar traditions, and motive and very relatable people.
A warning, though, expect a great deal of violence and some really disturbing mental images. Seriously. At times, you'll be reaching for the brain bleach.
The trouble with sources
Most of this is drawn from Michel Graulich's Le Sacrifice Humain chez les Aztèques and Montezuma, Jacqueline de Durand-Forest's Les Aztèques and Pratiques religieuses et divinatoires chez les Aztèques, various translations of the Popol Vuh, Claude-François Robez, les Mayas, with multiple Wikipedia tabs open to keep track of everything and, in English, works of a more general nature, such as Bruce G. Trigger's Understanding Early Civilizations, Marvin Harris' Cannibals and Kings and, naturally, Charles C. Mann's 1491. So a good deal of French-language works, I'm afraid, because that's what I can get from the library (Also, I can count myself lucky : I can't read Spanish, which would be best, but Mesoamerican scholarship in French is top-notch.)
As a rule, Mesoamerican history is told by an unreliable narrator. We can rely on Spanish sources, and native sources, written in Spanish or in Nahuatl, before and after the conquest.
Generally speaking, the Spanish aren't bad on facts, but they didn't understand much of what was going on around them. There's a general tendency to exaggeration, they may also misremember things. Hernán Cortés in particular is out to impress Charles V, which means he sometimes overstate the wealth of the newly conquered land. Oddly enough, he minimizes the cannibalism or the human sacrifices. The thing is, he was in trouble several times over. His expedition was unauthorized, much of the conquest was the work of his local allies, who were definitely in it for the sacrifices and the human meat.
Native sources are of course, invaluable, especially with respect to the native worldview. There are several issues with them: theycontradict themselves, a lot, as each city-state had its own version of history, or so it seems. The chronology is sometimes altered: Mesoamerica was big on astrology, and when history didn't quite match the predictions, the dates of birth are accordingly reassigned. The Mesoamerican conception of time is cyclical, so of course events tend to repeat in the chronicles. Pre-conquests, they were not above rewriting history, either. Famously, the Mexica tlatoani (king) Itzcoatl upon defeating his overlords had most of earlier chronicles destroyed and rewritten. Moctezuma II himself was himself in the process of rewriting chronicles and myths.
Other difficulties: writers rarely, if ever, bothered with the long/short vowels and the glottal stops in Classical Nahuatl. As a consequence, you get some widely different translations of the same thing. Are the Chichimeca the 'dog people' (chichi) or the 'breastmilk people' (chīchi)?
In addition, Nahuatl, especially in the poetic registers favoured by the nobility was full of puns, metaphors, and allusions. Does Quetzcalcoatl mean 'Feathered Serpent' or 'Precious Twin'? Both!
And of course, each historian brings their own interpretation to the table. Sometimes they change their mind: Michel Graulich dismisses the idea that Montezuma ate children as an obvious fabrication in Montezuma, but in 'Le Sacrifice Humain... boiled child is his favorite dish (Montezuma, not Graulich)!
So remember this thread is just an introduction, written by an amateur. I'll probably get things wrong here and there. Sometimes you'll read another version of a myth, or another interpretation, and that's OK. I just want to give an idea of how the Mexica were like to fellow conworlders and history geeks, so don't get into Internet debates or write historical fiction based on this, OK?
Oh, and finally, most of the thread, by necessity, will end up focussing on the elite, and on men. We simply have very little idea on how life was for women, commoners, let alone women commoners. Nobody really bothered writing about them at the time.
Some stereotypes and misconceptions.
You probably have a mental image of the Aztecs already. It's worth going through a few common stereotypes and see which of these hold up.
- The Aztecs were evil and barbaric.
We may wonder what would happen if Mesoamerican civilization had survived. It would put a whole new spin to the 'Clash of Civilizations' thing, wouldn't it? Besides, as conworlders, the question is especially important, because there's an element of storytelling in what we do. If you're reading a fantasy book and the authors describes ominous pyramids, or a culture that's into cannibalism, you've probably stumbled upon the Evil Empire. Well, bear with me here, but just because someone's into sacrificing children to the rain god or likes his temples caked with blood doesn't mean he's necessarily a bad guy!
In fact, the Aztecs were about par for the course, for a Mesoamerican civilization. They oppressed their rivals and vassals, much like any empire does, and in fact their enemies did the same thing to them as soon as they got the chance. They weren't any more evil than their neighbours: everyone in Mesoamerican believed that human sacrifice and cannibalism were part of life.
They're very relatable, actually, they held themselves to a high moral standard, valued poetry and the arts, and of course their fate is poignant.
(It's also worth mentioning that European history has its awfully horrific moments.)
- But still, they were particularly bloodthirsty.
- Reports of human sacrifices are much exaggerated or, it's all just Spanish propaganda.
Victims were well-treated, even fêted and treated as gods when the occasion called for it. It was a great honor to be sacrificed... but still a fate to be avoided. Usually, the people involved did their best to keep the victim reasonably happy. The victims weren't tortured.
We can sort of understand the sacrifice of war captives. Their fate wasn't worse than being killed on the battlefield. The sacrifice of slaves is harder to understand. I don't think it's possible to rationalize child sacrifice (for added horror, the children were sacrificed to Tlaloc, the rain god, and so they had to weep: their tears represented rain).
- Quetzalcoatl didn't require human sacrifice, or the Toltecs didn't practice it. Alternatively: the Aztecs invented human sacrifice.
- The Aztecs were less bloodthirsty than the Europeans, really. War was highly ritualized, nothing like our own total war.
Ritual wars -- also known as the 'Flower Wars' -- are best seen as a kind of cold war. But more on that later.
Other factors are in play: they obeyed a kind of international law: wars required an appropriate casus belli, and, lastly, a very jarring cultural factor: the Aztecs wanted to pull your heart out and then eat your flesh, but sometimes they could be exquisitely polite about it.
- The Aztecs were decadent and on the brink of collapse.
- The Aztecs were free of Catholic taboos imposed by the Conquistadores, also they had lots of sex.
- The Mayincatec.
There are a lot of commonalities between the Mexica and the Maya, especially the contemporary post-classic Maya. In fact the religions are similar enough that Mesoamerican scholars will bring up the Popol Vuh (the Quiché Maya "Bible") in trying to make sense of some obscure point in Mexica mythology.