Alright, step by step explanation time!
- Militaristic
- Expansionist
I don't really need to explain Militaristic, but Expansionist did have some competition. An Aztec civ could be Cultural, especially to tie into Religion, Diplomatic with complex Independent Power mechanics, or even have a Resource focus and be Economic. However, I wanted to focus on population and urban development here, so Expansionist was the path to take.
Chinampa: Can create Urban Districts on Lakes. Specialists can be placed in Towns and have +25% yield on Fresh Water.
I'm stretching the concept quite a bit to make this work, but please hear me out. Chinampa were artificial islands, mostly for agricultural purposes, yes, but the urban population of Tenochtitlan was within a lake too, so if we use Chinampa to generally represent Aztec expansion onto lakes, it fits? If we make that stretch, then, we can pull it out a bit farther to make your urban population more effective on Fresh Water. The easy access to water made for a quite sanitary society for the time, with accounts claiming that most citizens bathed at least once per day. Wouldn't those urban citizens be more happy and effective than in inland Europe?
There's probably a different term that could more directly reference
urban life on fresh water, but I don't have one on hand and Chinampa is a more well-known term, so I'm sticking with it for now. Personally, as long there's building on lakes, I'm happy.
Calpulli: Unique Quarter. Maintenance cost of Specialists is halved in this Settlement. Generates Food from excess Happiness.
Tianquiztli: Unique Gold Building. Gold adjacency from Quarters owned by Cities. Increased Resource Capacity in this Settlement.
Telpochcalli: Unique Happiness Building. Happiness adjacency from Quarters owned by Towns. +10% Gold to Purchasing units in this Settlement.
Tianquiztli is the Nahuatl term for a marketplace. As collecting Resources in the capital is going to be a theme here, we're using it to represent the movement of resources in your empire. It's more effective in or adjacent to your fully fledged cities (or maybe just your Capital, Augustus of Tenochtitlan...) but provides a Resource Slot and is needed for your Unique Quarter.
Telpochcalli were Aztec schools in commoner neighborhoods, providing some basic religious instruction while focused mostly on military training. They're more effective in your towns, which are less wealthy than your cities, and make it easier to quickly raise an army from the area.
Calpulli were districts of commoner housing in Aztec cities, in charge of governing their local areas (including Telpochcalli schools) and organizing tributes. By building a commoner school and infrastructure to collect resources, you have the things a Calpulli should govern: thus, you create a Calpulli. This closer governance helps to satisfy the urban population's needs and generate additional tribute from a satisfied population. However, this infrastructure comes at the same cost of most Unique Quarters: you don't necessarily want to build both of the buildings, let alone in the same place.
Triple Alliance
- Tier 1: Increased Settlement Capacity. The Pochteca unique Merchant is not affected by movement penalties in your territory. Unlocks the Tianquiztli building.
- Tradition - Pipiltin: Additional Gold and Culture on Specialists.
- Tier 2: +10% Happiness and Food in the Capital. -20% Happiness and Food in other Cities.
The Aztec Empire was led by an alliance of three city states. While they were initially equals, Tenochtitlan eventually became the hegemonic power, which is the point in time this civ is representing. This civic is being used to represent how the empire's leadership evolved, then, starting with increased connection between your cities and a greater capacity for governance and then consolidating power within your strongest city.
Pipiltin were the minor noble class, governing and receiving tribute from the area in which they lived. Their existence gets you more money out of your urban population, and is a part of your culture. This tradition is here because it relates to governance, which is kinda the theme of this civic.
Altepetl
- Tier 1: Increased Settlement Capacity. Additional Food on Improved Resources. Unlocks the Telpochcalli building.
- Tradition - Tribute Collectors: +20% Gold and Food in Towns.
- Tier 2: The Calpulli unique Quarter provides Adjacency to all buildings.
Altepetl is the word translated as "city state" when discussing the Aztec Empire. Thus, this civic focuses on improving your cities. The first tier gives you the ability to maintain more cities, as you are innovating in how your cities are organized. It also unlocks the Telpochcalli, to train the citizens of your settlements, and grants more Food from the resources that your cities control: your organization allowing your towns to grow more food, and thus for your cities to collect more. The tradition, Tribute Collectors, does what it says on the tin: collects more tribute from your towns.
Tier 2 represents an even greater dedication to the organization of your empire, and thus makes the centers of local governence more powerful for your city planning purposes.
Flower Wars
- Tier 1: Bonus War Support against Independent Powers and City States.
- Tradition - Sacrificial Captives: Gain Culture and Gold equal to 50% of the Combat Strength of defeated units. This bonus is doubled against Independent Powers and City States.
The Flower Wars were wars held with the intent of satisfying the gods with the shed blood, rather than to take land. At certain points in the Flower Wars, defeated nobles and occasionally commoners would be returned rather than sacrificed, thought as the wars drew out sacrifice tended to become more common. As the practice developed, the Aztec Empire began to use the Flower Wars as an opportunity to show off the nation's military force and to train their elite soldiers. It's a really gruesome concept, but it translates really well into gameplay. This civic is focused on encouraging bullying city states as much as possible to represent this. By inventing the concept, your get additional support towards wars with city states, and the Tradition gives you yields for your trouble, nice to slot in when you find a suitable power to torment. The name is very literal, both as a reference to the similar Civ 5 ability and because I think having Sacrificial Captives as an available policy in the Modern Age is rather funny.
Cult of Huitzilopochtli
- Tier 1: Additional Resource Slot in the Capital. Unlocks the Templo Mayor.
- Tradition - Gifts for the Tlatoani: Resources provide additional Happiness.
This one's pretty straightforward. Huitzilopochtli was the one of the most prominent Aztec gods, and was connected to the throne. The Templo Mayor was partially dedicated to him, so this civic unlocks it. The Resource theme is because Resources were used to represent tribute in Civ 6, hence the Tradition name being shared with Montezuma's ability in 6.
Eagle Warrior:
- Unique Infantry unit.
- Converts defeated Civilian units to your control.
- Lower base Combat Strength, but receive Combat Strength for every two Resources in the Capital. This bonus for every Resource against Independent Powers and City States.
Now that we've lost builders, Eagle Warriors need something else to represent their focus on capturing rather than killing. Now that Civilian units are destroyed instead of captured by default, the path is clear. However, since that's a tad on the situational side, the Eagle Warriors will also have the VI Aztec military bonus to play around with. Since Infantry units last the whole Age, I think this will help Aztec warfare feel unique. The bonus is stronger against IPs and CSs because screwing them over is half the point of the civ.
Pochteca:
- Unique Merchant unit.
- Using the Create Road action on a Town grants a copy of a random Resource present in the Town. The copy counts as an Imported Resource.
Pochteca were the merchant class of the Aztec Empire, and they traveled all over the empire. They had many duties, from acting as merchants, diplomats, spies, and even judges, and I think they're a clear contender for the Aztec Civilian unit no matter how you'd like to implement them. To keep things simple, though, and considering that most of their duties happened between Altepetl anyways, representing tribute collection is being added to their plate. Sorry Pochteca! The "Create Road action" seems to be a very vague equivalent of internal trade routes so far, so by doing it they weasel out a bit of extra Resource, likely to add to your Capital. Overall, they give you additional bonuses for strengthening connections between your Altepetl, hence why giving them extra movement capability is tied to the Civic about defining the relationship between your Settlements. This will also help to keep up some resource diversity if everyone hates you, and make the civ slightly less anti-synergistic with Hatshepsut. Sorry Hatshepsut!
Templo Mayor: Adds Happiness. Grants a free Civic when a Celebration is triggered.
The Templo Mayor, or Huey Teocalli (in retrospect it should probably be referred to as the latter) was the primary temple at the heart of Tenochtitlan. Happiness is tied to Religion in Civ VII and was tied to the Aztecs in Civ VI, so the rituals conducted there are being represented by Celebrations, which further the cultural depth of your civ.
In this concept, the Aztecs are able to create content and bustling urban centers, especially on their preferred terrain. The Gold generated from tribute can be used to raise up arms or invest further into your network of towns, which serve a strong city that is likely one of the most developed in the world. Mastery of using Exploration Age hydraulics for public amenities gives you a heavily increased capacity for consolidating your people in Urban Districts, making The Enlightenment well within your reach. Your need for ideal settling locations encourages colonization of the Distant Lands, and the resources and easy City State targets found there will mean your elite Eagle Warriors have a strong shot at winning you Non Sufficit Orbis. Happiness will help to build up your Specialists and trigger the Templo Mayor, so you might want to build up religious infrastructure and work on a cultural victory in the background. You don't have any particular bonuses towards Treasure Fleets, but your Exploration gameplan certainly leaves room to send some back home.
But of course, most important of all: the civ synergizes well with Augustus, and I find parallels between the Aztecs and the Romans very entertaining.