I find it very frustrating how one province minors in your alliance can get force annexed during wars even when your alliance is kicking ass. Realistically, I think you should have to occupy the province for at least a year or two before force annexing is possible (probably should be true for force vassalization also). Force annexation is the worst possible outcome for a nation, especially when it's a wrong religion, wrong culture enemy. shouldn't they at least wait for a while, "hiding out in the hills", or in exile or something, to see if help comes, or a general peace is settled, before giving in.
ag
ag