I only wanted their three easternmost provinces (and 2 are just colonies), yet no matter how many provinces I took they only offered up to 2 provinces. I kept taking more and more provinces hoping they would offer three, but they only offered 1 or 2 and always rejected my demand for those 3 (their lowest value provinces to boot) - even after I sacked their capital. Anyway, this whole process took so long (almost three years) that I got so mad I militarily annexed all of Persia. Big mistake. My BB got so high I was jumped by Crimea, Golden Horde, Astrakhan, and Sibr. I brought in my ally Georgia to hold off Crimea, but my war exhaustion of 3 started getting me in trouble revolt wise, so I bought off the attackers. Now Spain has DOWed me but they have very weak forces so I'll probably just occupy Madrid until they sue for a white peace - I don't think I can afford to take any more provinces right now.