Certain actions (such as going to War or leaving an Alliance) do not require both sides to consent to a Treaty. However, nearly all other diplomatic relations start with a Nation writing a Treaty Proposal to another Nation. The recipient of the Proposal can review the terms at their own Ambassador, and either accept or reject it. Once accepted, the terms of a Treaty go into effect immediately.

To begin crafting a Treaty Proposal, click the Write a Proposal button, then select the Nation you want to send it to. A single Proposal may only have a single recipient - however it can include as many terms as you'd like.

So what sorts of terms can be included in a Treaty?

Depending on your current Treaties with other Nations, some of these options will change. For example, if two Nations are at War with each other, the Declare War option will change to Declare Ceasefire.

And finally, don't forget to name your Treaty by selecting the icon at the top center of the Create Treaty Proposal menu. The recipient will of course be able to see this name. In the case of creating a new Alliance, the name used here will be the official name of the Alliance.