I've played more games of Civ2 than I should have, but only once or twice have I seen a civilisation split in to two part - something like loyalists and rebels. In practise, civ2 just splits off some cities and gives them to a new civilisation.
Does anyone know what triggers this rare event? Does anyone have a screen shot so I can reminisce!?
additional link: https://forums.civfanatics.com/threads/civil-war.462908/ An old post now (aren't we all..., ho hum). They discuss civil war, one poster says it happened in Civ2, someone else says the original Civ (which I did play 20-25 years ago, but that definitely wasn't what I was thinking of).