Western Alliance
The WA is a forum formed early in the map between several influential like-minded states.
The members as of 2018-03-12 are Commonwealth, Falstadt, Impasse, Mir, and Yoahtl.
The WA is most famous for being one of the sides in the Somber War, with Lexington being the other.
To become a member of the WA, a state needs to be reasonably well-established and have stable leadership, and pass a simple majority vote among the leaders of each member state.