Using diplomatic actions
You must be in diplomatic range to use most diplomatic actions except ending or declaring wars and asking for or canceling military access. The diplomatic range is determined by capital distance, all countries you border are in diplomatic range.
Some diplomatic actions are locked depending on your country rank. For example, only a Regional Power can use the Proclaim Guarantee action. If your government type is a republic, the senate will vote on the action, although you can still force it through even if a majority votes against it. This will give you tyranny.
Diplomatic relations cap
A nation, depending on its rank, can have a number of diplomatic relations. Each Alliance and Tributary counts as 1 relation, while a defensive league occupies just 1 slot, no matter how big it is. For each relation over your limit, all your power costs are increased by 10%.
Increasing the diplomatic relations cap
You can increase the number or relations by increasing your size.
|Country rank||Extra relations|
|City State||+1 Diplomatic Relations|
|Local Power||+2 Diplomatic Relations|
|Regional Power||+3 Diplomatic Relations|
|Major Power||+4 Diplomatic Relations|
Declare War / Sue for Peace
Declares war on another nation.
Creates an alliance between two nations.
Invite/Kick/Leave Defensive League
You need to be a City State or Local Power to use this action.
You need to be a Major Power or greater to use this action. You can protect any nation of lower rank from being attacked, giving you Casus Belli on anyone attacking them.
Intervene in War
You can join on any side in a war, where you have good relation with the war leader. You need to be a Major Power to use this action.
You can use a claim, to demand a nation to secede a city or province to you, to avoid an expensive war. You need to be a Major power or Great Power to use this action.
You can force a white-peace on a nation in a war, if you have good relations with their enemies. You need to be a great power to use this action.
Improves your relations with another nation.
Request/Cancel Trade Access
Ask/Cancel Military Access
Lets you move your armies through another nation's territory.
Offer/Cancel Military Access
Lets another nation move through your territory.