My guess is that it makes the culture of provinces turn faster, but I'm not sure. So, does anyone know what it does?
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The civilization value of a province is a value that determines the risk of barbarians aiming for that province (as a high civ-value equals loot and bragging rights if you destroy it) and if a barbarian province is bordered by a 50+ civ. province with at least 10 population that province can be colonized.
Provinces with high civ-values are also more costly in peacedeals and provinces close to a higher civ-value province will also see its own civ-value increase over time. Trade with a higher civ-value province will also increase civ-value more rapidly than normal.
Other than allowing a rich king build monuments in a province (by event), there is however no way to increase civ-value.
Provinces with high civ-values are also more costly in peacedeals and provinces close to a higher civ-value province will also see its own civ-value increase over time. Trade with a higher civ-value province will also increase civ-value more rapidly than normal.
Other than allowing a rich king build monuments in a province (by event), there is however no way to increase civ-value.
So how does civilization *SPREAD* work? Does it increase the civilization lv of every province over time, provinces with civilization lower than the capital, or low civ provinces that trade with high civ provinces?
It spreads from higher-level provinces to neighboring/trading lower-level provinces (compounding). It also spreads by tribute: if you pay tribute to a country whose capital has higher civ than yours, you get a big boost. Mouseover the civ level on any province menu to see how that province's civ is increasing.
Civilisation Spread increases the rate at which civ value transfers between provinces.
If you look at the tooltip for a province's civ value, you'll see what is increasing it, such as trade with a more civilised province, or simply being neighbours. This number is multiplied by the current civ value and added to it each year (IIRC). When you have a Civ Spread modifier, it affects this number.
For example, if you have a province which is getting 0.05 civ from trade and it gets a +0.5 (ie +50%) Civilisation Spread modifier, then it will increase to 0.075.
So then the modifier that the Imperial form of Government has is rather wimpy then... thank you for answering.