📋 The Basic Rule

To declare war on another country in HoI4, you first need to justify a war goal. Without it, the game simply won't let you press the "Declare War" button. Justifying costs political power and takes time — the higher the world tension, the faster the process. Some countries can get a war goal instantly through national focuses — in that case, justification isn't needed at all.

If you want to justify a war goal manually, right-click on another country and select "Justify War Goal", then pick the goal you want. Once the timer runs out, the goal is justified and you can begin hostilities.

Keep in mind — a manually justified war goal expires after a certain time. If you don't declare war before it runs out, you'll lose stability and war support.

Once the war starts — for example, after you declare war on another country — you can capture its territories and create encirclements with your divisions. The country you declared war on can do the same to you. After the declaration, both you and the enemy will be added to the list of ongoing world wars.

⚖️ Ideology Restrictions

Not everyone can declare war whenever they want. Below are the conditions each ideology must meet to justify a war goal.