- +10% Production efficiency
- +15% Fort defense
- −10% Idea cost
- +1 Possible advisor
- −10% Land attrition
- +1 Prestige
- +10% Morale of armies
- −15% Stability cost modifier
- −10% Recruitment time
- +10% Goods produced modifier
Starting situation and early game
Charca borders Calchaqui, Pacajes and Colla, all 3 of them easily conquerable. Charca has only one expanding direction (N) at the start of the game. They also hold Potosi, the most lucrative gold mine in the game and have decent traditions and early ideas: +10% Production efficiency and first idea gives -10% Idea cost. They also have one of the fastest routes to reforming religion, needing only 4 or 5 provinces to be colonized in order to border European colonies.
Allying just one of their neighbours, Charca can annex another and vassalize the third one. Going further North, into Cusco, with the help of a new ally and the vassal gained from the last war, gives control over most of the central and southern part of the Peru regions before 1480. By 1490, Quito or Lima provinces can be easily conquered. To the East, Guarani and Mapuche tribes will periodically border Charca. This is a good time to annex them, to get closer to Brazililan lands needed later. Ideally, Charca should border European colonial provinces before 1550, somewhere near Rio de Janeiro or La Plata. The religious reform removes primitive maluses and adds some tech levels for free. It is possible to be upgraded directly to Great Power status after reforming religion, but that is almost useless early on. Changing the country's religion will also benefit in the long run.
Choosing Exploration and Humanist ideas will help discovering and colonizing empty lands, as well as reducing unrest and prepare for adopting a new religion. Mid-game, Trade and Maritime ideas will greatly improve trade income and naval forcelimits, as well as giving access to useful policies. Administrative and Plutocratic idea groups can also be considered.
Having a powerful European ally is very hard due to different religions and distance between borders. It is recommended to annex, if possible, one of the islands in Macaronesia. Doing this halves the border distance malus to alliance acceptance. Having 2 common rivals and good diplomatic reputation can add a very needed alliance. Usually, Spain will attack on every truce end, trying to complete their missions of owning Peru and Potosi. Allying Spain is almost always impossible, but Portugal, France or England can be befriended and will prevent Spanish aggression.
If found defending against European countries, Charca can use the navy to defend itself, as colonial nations do not pose a threat locally. Keeping up with Diplomatic technology gives enough naval morale to ward off any invasions and focus on sieges in South American enemy provinces, protecting the wargoal. Colonial provinces are very cheap to demand in peace treaties. When attacking colonial nations, their overlord will not join them in the war and it is easy to take land from them. Sometimes, European nations will have only 4 provinces in a colonial region, thus not creating a colonial nation and Charca will have to attack them directly to gain the provinces. Again, a good navy will do most of the job. If attacked on multiple fronts, it is recommended to concede provinces, rather than fighting and risking to get stackwiped, sieged completely or getting into much debt. Taking the provinces back is easier later on.
Mid and late game
By 1650, the most of South America can be under Charcan control, collecting trade in Caribbean and Brazil nodes and having a top five navy. Developing provinces and buildings will be difficult, Charca should improve its gold mining and naval capabilities, while saving up money to embrace institutions. In a peaceful scenario, the entire continent can be owned before 1650. It is, though, imperative that Charca keeps hold of Potosi, as it generates a big part of its income and can result in serious economic trouble if lost.
Inca and A Sun God
Choosing to form Inca will swap Aimaran ideas with Incan ones, as well as upgrading to Empire rank regardless of total development. Additionally, some tactics from the Sun God guide can be adapted to the Charcan campaign.
Tawantinsuyu, the Empire of the Incas
If the country is AI-controlled then it:
Inca does not exist.