if your a secndery power u gain an event that makes u go to war against that GP, u will probably lose though. oh and u need to have less than 0 relationship with them, if u get 200 that means 8 diplomatic points whats realy anoying is the waiting time between spending them
What if I am only a civilized nation? Because I can't declare war on any of my neighbors due to them being in the same sphere as me.