Bug?

[unmerged(112901)]

I was playing as the Dominican Republic. I declared war on Haiti which cost me 50 prestige points. After liberating their province, Haiti offers a white peace which if I accept I get 100 Prestige points. Now I have plus 50 prestige just for attacking then making peace. I did it a second time and got more prestige though not as much. So now D.R. is ranked 18th and on the rise.

 

[Eärendil]

It's not a bug. Also, if you humiliate them in a peace deal all further declaration of wars on them will only cost you one prestige (assuming that they get less than -100 prestige after the humiliation).

However, I find the game less fun if I use too many exploits like that.