I am trying to understand the circumstances under which it is possible to remove a province from the HRE, as it seems nearly impossible. The only surefire way I have found is that a Muslim country automatically removes any HRE land it takes from the Empire. However I feel like I remember France being able to do the same thing. I haven't played as them in some time, but in my games the French AI never takes the provinces out of the Empire. In fact, in multiple of the scenario start dates they are already controlling fiefs in the Empire.
As an extension of the above, I feel like I remember seeing the Netherlands/Switzerland/Italy leave the HRE throughout the game, but again I cannot seem to replicate this in my own games. The borders of the Empire remain static throughout the entire game no matter what, and even in the last 1795 start date these countries are still full Electors in the Empire. Perhaps it is a case of mistaken memory, or something was changed in a patch, but I am very interested to see if anyone still lurking these forums has any insight into this. The game manual only mentions the Muslims.
As an extension of the above, I feel like I remember seeing the Netherlands/Switzerland/Italy leave the HRE throughout the game, but again I cannot seem to replicate this in my own games. The borders of the Empire remain static throughout the entire game no matter what, and even in the last 1795 start date these countries are still full Electors in the Empire. Perhaps it is a case of mistaken memory, or something was changed in a patch, but I am very interested to see if anyone still lurking these forums has any insight into this. The game manual only mentions the Muslims.