How do PUs form? Do you have to "Claim Throne" when you have a royal marriage and if so, will it randomly give you the throne if successful, or do you have to use the casus beli and go to war for it?
And I tried out my Hungary game again, the electors are switching just a few weeks before each Emperor's death and voting for Bohemia, any way I can stop this without vassalizing each elector? And I was finally able to annex Transylvania after expanding my sphere a bit. Thanks for the help so far guys.