保护国（已移除）

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A  protectorate is a subject nation that is protected diplomatically and militarily against third parties by a technologically superior nation. Protectorates exchange diplomatic independence and trade power for a protective military alliance. Establishing protectorates is a useful method of controlling an area without directly annexing it.

Establishing a protectorate

 此内容可能已落后版本，最后更新于1.16

Protectorates can be established diplomatically, contingent on number of factors.

The requirements for diplomatically establishing a protectorate are as follows:

1. Target country's capital must be within trade range.
2. Target country must be at peace.
3. The difference in technology cost between the future overlord and the target country must be greater than or equal to 50% (otherwise the target can only be made a vassal).
4. Target country does not have the steppe nomad government type.
5. Target country isn't in the same continent as the overlord.

Willingness to become a protectorate is shown in the tooltip for the check-mark in the establish protectorate button.

The factors that influence an AI nation's desire to become a protectorate are:

Factor	Effect
Attitude towards proposer	Friendly: +10
	Threatened: +10
	Neutral: -20
	Hostile: -1000
	Outraged: -1000
Opinion towards proposer	Scales linearly between the following points:
	+25 at +200 opinion
	0 at 100 opinion
	-25 at 0 opinion
	-1000 at <0 opinion
Proposer's diplomatic reputation	+3 per positive point
	-3 per negative point
Proposer economic base compared to target nation	+30 to -90
Proposer military power compared to target nation	+30 to -40
Number of existing protectorates	-10 for each
Proposer is a merchant republic	-10
Nation has subjects of their own	-1000
Nation has over 200 development	-1000
Distance between borders	-0.5 per distance between borders†

†: Distance between borders can only be seen in debug mode.

Additionally, a protectorate may be enforced militarily through conquest. This peace offer can be enforced in any war against a valid protectorate target, but requires 100 war score.

Requesting a protectorate

 此内容可能已落后版本，最后更新于1.16

A nation that is technologically inferior to a colonizing nation can request to be a protectorate of said nation.

The requirements for requesting a protectorate follow similar rules to establishing a protectorate and are as follows:

1. Proposing country's capital must be within target country's trade range.
2. Target country must be at peace.
3. The difference in technology cost between the target country and the future protectorate must be greater than or equal to 50% (otherwise the controlled nation can only become a vassal).
4. Proposing country does not have the steppe nomad government type.

Willingness to accept a nation as a protectorate is shown in the tooltip for the check-mark in the Request protectorate button.

The factors that influence an AI nation's desire to accept a nation as a protectorate are:

Factor	Effect
Strategic interests: * domineering attitude * protective attitude	Always accepts
Attitude towards proposer	Friendly: +50
	Neutral: -20
	Hostile: -1000
	Outraged: -1000
Opinion towards proposer	Scales linearly between the following points:
	+25 at +200 opinion
	0 at 100 opinion
	-25 at 0 opinion
	-1000 at <0 opinion
Proposer's diplomatic reputation	+3 per positive point
	-3 per negative point
Proposer economic base compared to target nation	+60 to -350
Proposer military power compared to target nation	+60 to -350
Distance between borders	-0.5 per distance between borders†

†: Distance between borders can only be seen in debug mode.

Effects

 此内容可能已落后版本，最后更新于1.16

When a protectorate is established, the following effects occur:

• Cannot be diplomatically annexed.
• Does not take up a diplomatic relations slot.
• Transfers 50% of its trade power to its overlord.
• Gives military access and fleet basing rights to its overlord.
• Receives a -20% technology cost discount
• Will not westernize if controlled by the AI, but finishes if it becomes a protectorate while doing so (players nations are not restricted by this).
• Breaks all previous alliances, personal unions, and frees all vassals. The protectorate retains control of colonial nations and may form new ones.
• Can declare war against other nations (except other subjects of the same overlord) without the overlord being called in.
• Can not be called into its overlord's regular wars, but automatically calls its overlord into a defensive war if attacked. With the Cossacks DLC, overlords can designate wars as Colonial Wars, which call in protectorates and other subjects but do not call in allies.
• May request independence if its liberty desire is greater than 50%.
• Can only renounce its protectorate status through an independence war or becoming a Great Power.
• Cannot be the target of coalitions.

Subject interaction

主条目：Subject_nation#Subject_interactions

Interactions with colonial nations are performed through the Subject Interaction section of the Subject Menu.

An overlord may cancel a protectorate for a -1 stability loss. This cost is reduced to 0 by completing  Diplomatic ideas. Unlike with vassals or guaranteed states, releasing a protectorate does not introduce a truce. With a proper CB, it is possible to attack a former protectorate or overlord immediately after the relationship is cancelled.

Strategy

 此内容可能已落后版本，最后更新于1.16

When playing as a technologically superior nation, the following points should be noted:

• Protectorates can be used to control territory in Africa and Asia. Militarily enforcing a protectorate makes the nation a subject, avoiding the expenditure of administrative power.
• If territory of potential protectorate is desired, e.g. for a trade company, military conquest of the province is generally more desirable than enforcing a protectorate. This is due to the fact that Seize territory increases liberty desire significantly per development of the province seized.
• Protectorates can also control trade in Africa/Asia, as enabling divert trade results in the subject transferring 100% of its trade power to the overlord.
• The military of a protectorate is called to arms in colonial wars. This provides supplementary troops for expansion in Africa and Asia against other potential protectorates. However, it is less useful against European nations, as protectorate forces are rarely comparable against a colonial power.
• Protectorates count as subject nations for the purposes of certain achievements.

When playing as a technologically inferior nation, the following should be noted:

• The player nation receives a 20% discount to technology cost. This usually runs counter to the general strategy of westernizing as soon as possible, as monarch points spent of teching up could be used for westernization. However, the bonus is useful for keeping up in technology if westernization is unfeasible.
• Additionally, the nation receives a powerful defensive ally in wars against other powers. Therefore, the protectorate can overextend in wars so long as its overlord is strong enough to protect it from potential attackers. This does not, however, prevent the protectorate from losing a war and associated territory.
• Protectorates are immune to coalitions. Therefore, rapid military expansion is possible with appropriate targets and military strength, and is not subject to aggressive expansion.

Footnotes

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