Diplomacy

Diplomacy is how empires and empires interact with each other, from Trade and Treaties to Crisis and War.

All the diplomacies in Humankind are carried out in the Diplomacy Screen, which divides into 4 windows: Relations, Trade, Treaties, and Crisis. Relations deals with the general relations between empires, Trade deals with resources trading and trade routes, Treaties deals with agreements and alliances, and Crisis deals with grievance, demands, and war negotiations.

Relations
The Relations window will show up when clicking an empire's icon/roundel, which displays your diplomatic state with the selected empire, as well as both empires' relationships with others. You can change your diplomatic state here, such as declaring war or propose an alliance.

Diplomatic States
The relationship between two empires will always be one of the below diplomatic states:

Unknown

 * The two empires don't know each other. This is the default state with empires you haven't meet.
 * When one of your units spotted a city of another empire but not vice versa, you will know the existence of the other empire but they don't know you. In this case, you can use the Introduce Yourself button on the Relations window to make the other empire know you.

Peace

 * The two empires are not at war. This is the default state between two empires.
 * When at peace, treaties can be proposed, resources can be brought and sold, alliance can be offered, and demands can be made.

Alliance

 * The two empires are allied with each other, lead to closer relationships and deeper cooperations.
 * Alliances need to be proposed in the Relation window via the Propose Alliance button. Similar to other diplomatic proposals, the others can ask in return for accepting, and if the proposal is being refused you need to wait  before proposing it again.
 * Allied empires are not only benefited from basic treaties but also able to propose more advanced treaties, receive larger benefits and supports from each other.
 * Allied empires can demand each other join an ongoing war; refusing will allow the ally to break the alliance.
 * Alliance can be break via the Break Alliance button, and will cause an increase in War Support of the other empire.

War

 * The two empires are at war with each other. When in war, treaties between empires are not applicable, so as trade (unless Trade at war civic is enabled).
 * War can be declared in Relation window using Surprise War (Needs  or higher War Support) button or Declare War button (Needs 80 or higher War Support).
 * The War status will only end if a White Peace is accepted or one of the warring empires Surrendered. There is currently no "negotiated peace" or "peace with terms".

Vassal and Liege

 * When an empire Surrendered in a war, "Become a Vassal to [the winning empire]" can be picked in the Surrender Terms.
 * If imposed, the losing empire is now a Vassal, and the winning empire is now a Liege.
 * The Vassal must provide a tribute to the Liege in the form of per.
 * The Liege controls the Diplomatic States, State Religion, and Treaties of its Vassal. Treaties negotiated with a Liege will be applied to its Vassals as well, and declaring war on a Liege will also drag its Vassals into the same war.
 * On the other hand, Grievances and Demands caused or received the Vassal must be handled by the Liege.
 * The strategic and luxury resources of the Vassal and the Liege are shared. The Liege can have access to its Vassal's resources, and the Vassal can have access to its Liege's resources as well. No purchase or trade routes can be established between the two due to the sharing.
 * The British culture, when being a Liege, can also build their Colonial Office emblematic quarter in their Vassals' territories.
 * The Liege can liberate its Vassal using the Grant Freedom button on the Relation window. The Liege will lose any resource access or tribute it had from the Vassal, and the Vassal will have diplomatic freedom once again. The Treaties between the two need to be renegotiated.
 * The Vassal can also demand their freedom from the Liege. If the Liege refused the Demand, the Vassal and Liege will go to war.

Influencing the Relationships
The specific relationships between empires, especially between players and AI empires, are defined and influenced by Attitudes and Ideological Proximity. Certain actions can improve the relationships and lead to more cooperation, while others can deteriorate the relationships and lead to conflicts.

Attitude, Trust, and Strength
Every AI empire will have a specific Attitude towards the player. The attitudes can be either negative, neutral, or positive; and the attitudes can be impacted by conditions such as diplomatic actions, military strength, etc., and changed over time.

Trust and Strength are the categories of conditions that can improve/deteriorate other's Attitude.


 * Trust depends on the Treaties, Trade, Ideological Proximity, Grievances, Demands, State Religion, Archetype of the Avatar, etc.
 * Conditions such as benefits from treaty, buying resources, close ideologies can improve AI's Trust and Attitude.
 * On the other hand, not negotiating treaties for a while, downgrade treaties, pushing demands, and declaring war can deteriorate AI's Trust and Attitude.
 * Strength depends on the military power, researched technology, resource dependency, War Support, etc.
 * Conditions such as a strong military, higher War Support, and having others depend on access to your resources, will make AI respect or even fear you, resulting in an Attitude more advantageous to you.
 * On the other hand, weaker in military and having less War Support will make AI disrespect you or even try to bully you, resulting in an Attitude more unfavorable to you.

Types of Attitudes
Trust and Strength can result in different and changing Attitudes:

Ideological Proximity
In Humankind, the choices you make in civics or narrative events will influence and define the ideology of your empire. Each empire has their own unique ideology, and there will be differences between different empire ideologies.

The ideological differences can be measured in Ideological Proximity, which will influence the diplomatic relationships - including Attitude, especially regarding negotiating treaties and war support - between empires.

There are 3 levels of proximities:


 * Distrust: The ideological differences between your Empires are stark, making it difficult to collaborate (i.e., difficult to sign Treaties). The other side's War Support only increases slightly if you break agreements with them, while declaring war against them does not decrease your own population's War Support.
 * Tolerance: Despite a few ideological differences, your Empires are able to mostly get along. War Support is gained when the other side breaks a treaty, and is drained each turn from the side which declares war.
 * Kinship: Your Empires have few ideological differences, making cooperation smooth and easy (i.e., easy to sign Treaties). The other side's War Support increases if you break treaties with them, and declaring war against them severely decreases your own population's War Support.

If two empire's position on Ideological Axis are similar to each other, the two empires can enjoy a close Ideological Proximity.

The Cultural Agreement Alliance Treaty will also gradually rise the Ideological Proximity of both empires to a higher level.

Trade
Main Article: Trade

The Trade window displays both empires' resources as well as Trade Routes. Once you and the other empire signed the Only Trade Luxuries treaty or above, you two can begin to trade resources with each other here.

Treaties
The Treaties window lists all treaties occurring between your two empires. You can propose new treaties here or break/downgrade existing treaties.

There are 4 categories of Treaties:


 * Trade, Treaties defining what Resources can be bought and sold and what tariffs are applied to these exchanges;
 * Information Sharing, Treaties restrict how much strategic intelligence is shared between the two Empires;
 * Border Policy, Treaties defining how open your Empire's borders are to others' beliefs and military forces;
 * Military Accords, treaties which constrain military interactions between the Empires' Armies.

Treaty Mechanics

 * One can propose a treaty to others for every.
 * For treaties proposed by others, one can either accept, counter, or refuse.
 * Counter means asking in return for accepting the treaty. If you don't have enough money, the treaty can only be refused.
 * Refused treaties can be proposed again after.
 * When two empires meet for the first time, all the treaties will be the most basic ones. Higher level treaties will have a larger benefit, while keeping certain agreements of the basic treaties.
 * Alliance can open up more advanced treaties.
 * Breaking treaties or refusing treaties too many times will cause the other empire's War Desire to increase.
 * Downgrading or breaking Trade Treaties can force certain trade routes to stop, lead to extra Grievances.

Treaties and Alliance Treaties
All the possible treaties under normal circumstances are listed below, with basic treaties listed higher and advanced treaties listed lower.

Crisis
The Crisis window lists all Grievances occurring between your two Empires. You can make Demands here, as well as settling the negotiations of a war.

Grievance and Demand
See also: List of Grievances and Demands

Settling War
White Peace

Surrender