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Revolutions occur when your stability is low. Their is a option in the political tab of your country. It is called general after clicking it may give you a couple of options. The option you'd want to click is improve policy this will grant 2 political stability for 25 political points it maxes at 60% stability

Usually you're in a war with a different enemy or the current enemy has a small island somewhere, but sometimes it does bug out. Allyou have to do is save game exit the program and load the save file and it should take you out of war mode.