Mr Bee (the guy from IGN who did the reviews) has released information about the Vassal States. I have just copied and pasted the information here for those who cannot view the CFC site.
Quoted from a post on Civfanatics by Mr Bee, from IGN:
"There have been tons of questions about the Vassal states, so I thought I'd offer an overview of how they work.
There are two ways to become a vassal state:
1. During peacetime, a civilization may voluntarily become a vassal. The vassal (NOT the master) is given the option to renew the relationship after 10 turns.
2. A vassal relationship that arises during wartime is referred to as Capitulation. It differs from the peacetime arrangement in that the vassal can't break the relationship unless a) it grows to at least half the size (land and population) of the master or b) loses more than half the territory it owned at the time the agreement was created.
There are some notable benefits to being a master:
1. The master enjoys complete freedom of movement in the vassal's territory, including the ability to heal and use fortifications owned by the vassal. The master can also investiage any vassal city.
2. The master can demand any resource from a vassal, even those that the vassal is using. The vassal has the right to refuse the demand but if they do they two states are immediately at war.
3. The master's people enjoy increased happiness. Those in the vassal empire suffer decreased happiness.
4. The vassal can't make war or peace on its own. It immediately adopts the master's war and peace relationships.
5. Half of the vassal's territory and population count towards the master's domination victory AND score.
So far, so good. But there is at least one significant downside to being a master. Every vassal increases the maintenance costs of each of the master's cities."
Quoted from a post on Civfanatics by Mr Bee, from IGN:
"There have been tons of questions about the Vassal states, so I thought I'd offer an overview of how they work.
There are two ways to become a vassal state:
1. During peacetime, a civilization may voluntarily become a vassal. The vassal (NOT the master) is given the option to renew the relationship after 10 turns.
2. A vassal relationship that arises during wartime is referred to as Capitulation. It differs from the peacetime arrangement in that the vassal can't break the relationship unless a) it grows to at least half the size (land and population) of the master or b) loses more than half the territory it owned at the time the agreement was created.
There are some notable benefits to being a master:
1. The master enjoys complete freedom of movement in the vassal's territory, including the ability to heal and use fortifications owned by the vassal. The master can also investiage any vassal city.
2. The master can demand any resource from a vassal, even those that the vassal is using. The vassal has the right to refuse the demand but if they do they two states are immediately at war.
3. The master's people enjoy increased happiness. Those in the vassal empire suffer decreased happiness.
4. The vassal can't make war or peace on its own. It immediately adopts the master's war and peace relationships.
5. Half of the vassal's territory and population count towards the master's domination victory AND score.
So far, so good. But there is at least one significant downside to being a master. Every vassal increases the maintenance costs of each of the master's cities."
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