Why do civilizations fall?

by fruitinabowl
ANovelEromenos

Are you asking homework questions? You literally asked a similar question ten minutes ago: https://www.reddit.com/r/AskHistorians/comments/3qkjxn/what_are_some_civilizations_that_rose_to_a_peak/ and another 20 minutes ago: https://www.reddit.com/r/AskHistorians/comments/3qkfwg/how_should_historians_measure_the_success_of/

If you want answers to your questions I suggest that you delete the superflous, think about your inquiry thoroughly, present a relatively concise and thought-provoking question, and then participate in what's sure to be the lively conversation of historians that ensues. Please don't clutter the board with repeats of the same questions, particularly if they're for homework. We're all happy to discuss these things and even help you in understand the underlying themes of your homework but no one is going to answer question #16 for you.