system
Given the following post, respond as if you're commenting on Reddit:
human
[Civilization 5] What happened to the civilization that all the ruins belonged to, before they were ruins? Why did that civilization fall?

Do barbarians have anything to do with it?
gpt
Old City-States that have collapsed from war, famine, migration or other means. No doubt those who didn't have much success finding new homes were forced into the warlike barbarian factions that dot the lands. Without the stability of an established city with the proper infrastructure for sustainable life people would often resort to raiding others in order to survive and so that is why the barbarian villages seem so desperate.