Betwixt the eras of the poet and the scribe, there were bards to sing of the whispered rumors among the nations dared not be spoken for their "benefactors" to hear. From lost eras wherein people were so far apart and knowledge could only be spread by word of mouth to now with world-wide-web-interconnectivity, history has been shared in one form or another. How accurate these tales have been comes down to the deliverer's measure of how willing his audience had been to listen. Sometimes, a simple story had to be spiced just a bit. History, sadly, is boring, as it repeats itself again and again. From the birth of a life, to the emotional and physical struggles to maturity, to the eventual death which befalls us all, there is no originality in history. Just look to Christopher Booker's "Seven Basic Plots" (found here: Denis Dutton on The Seven Basic Plots) and you'll also see that there is no originality to the plot of literature either. You can go to tvtropes.org to see that every conceivable twist, turn, tunnel, turbulence, and truism (cliché) has been done over and again.
Strife and chaos rise because someone is unhappy with the present. That someone feels there is something missing from "life," unidentifiable as it may be. Sadly, without strife, there would be no forward momentum. We would be amoeba in a puddle. Some people are satisfied with the security of the familiar. Others desire a threat to their security (albeit subconsciously) so that they can appreciate life's charms.
But by and large, the cycle continues and the waves of the ocean continue outward toward the shore and the stars in the night sky continue ever outward as years pass. Perhaps someday new life will emerge, something we've never seen. But then that lifeform will begin it's own cycle. It will certainly be interesting to watch while it lasts, but as I've said twice or three times so far, history repeats.