Average age of world’s great civilizations from the beginning of history

The average age of the world’s great civilizations from the beginning of history, has been about 200 years. During those years, these nations always progressed through the following sequence: from bondage to courage; from courage to liberty; from liberty to abundance; from abundance to selfishness; from selfishness to complacency; from complacency to apathy; from apathy to dependency; from dependency back again to bondage. ~¬†Alex Fraser Tytler
http://www.fujishimaitsuo.de/2012/02/05/cambodia-i-ancient-ruins/