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In Civilization IV, a Vassal State is a civilization that is, in a sense, "owned" by another civilization, though they still have control over their territory. The human player's civilization most likely cannot become a vassal, as the option to do so is never available.
Becoming a Vassal StateEdit
A civilization can become a vassal of another if the first civilization is at war with the second and capitulates, if the first civilization asks to become the second's vassal for protection, or if the second civilization (most likely controlled by a human player) successfully convinces the first to become a vassal. If the master or "owner" civilization declares war on another, the vassal automatically does so as well. Colonies are similar to vassal states, except colonies do not exist until their Mother Country (like masters in a regular Vassal State agreement) grants them independence. Normal Vassal States exist before becoming vassals.
Pros and Cons of Vassal StatesEdit
Ending a Vassal AgreementEdit
A voluntary Vassal State can declare autonomy at any time, though its master may choose to go to war with it in response. A capitulated Vassal State can regain its autonomy under one of three conditions:
- The Vassal State loses more than half of its territory that it owned at the time it became a Vassal State. Note that any cities or territory a vassal loses to its master through culture flipping also count towards the loss of territory condition.
- The Vassal State grows in size AND population to a point where it has more than 50% of the master's size AND population. This is a two-part condition, so both parts have to be met in order for the vassal to regain its autonomy in this manner.
- The master demands a particular resource and the Vassal State refuses the master's request. This ends the vassal agreement and puts the two civilizations at war with each other. Since the vassal cannot refuse the master's first demand for a resource, this situation is not likely to occur unless the master is reckless or heavy-handed with resource demands.