The end of civilizations and their rebirth

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Ive been thinking of different scenerios that could take place over several millenia. What we think of as science fiction could one day be reality. This post has nothing to do with religion, so i hope you will refrain from making it one. I have a theory that the end of civilization is not truly the end. Life has a unique way if starting up again when life has gone. Take winter when the grass dies and the wild flowers wither away; in the spring life renews itself. In the freezing winter frosts within the ground kills off the insects, but when the spring sun and warm rains come back, so do the flying and crawling insects. Kind of like the renewal of lower life forms, whole civilizations have died off and have been regenerated in some way. I've watched lots if different documentaries that suggest that civilizations come and go. I mean, it might just be the end of an age. Supposedly, the Neanderthals came to an end...but the Neanderthals might have inbred with some of the homosapians before they died out. The Myans came to an end. The Aztecs came to an end. I think the Aztecs became Modern day Mexicans. I believe make a difference too. Wars influence how society works over time. Regimes change and so do the rules of society. When a war takes place and the 'enemy' conquers a place in the world, the language and culture of a place may change. What if one day the United States ceases to be The United States but is invaded and ruled by another country, through an act if war, we could cease to exist and another civilization could take up residence. It seems that any time there is and end of civilization there is eventually a new one to take its place. I'm not referencing 2012 because that's just garbage as far as I'm concerned. However, I do believe that we will somehow wipe ourselves out as a people due to any number of potential causes. War might be one way life us changed. Global warming might be another way that people wipe thenselves out. lack if fresh water and ither natural resources might be another way we etase ourselves. I believe the fittest will survive whatever calamady occurs on the earth. If the polar ice caps were to melt away the flooding would probably cover the earth. What happens if during a future mimmenium that the earth is completely covered with water. Would human life cease to exist? I don't think so. I do believe the weakest of human life will die out, but the strongest of mind will find a way to survive. Maybe human life would take to the oceans and thrive in future millennia. Think far beyond yourself and describe what you think human life might come to if the dynamics if our earth were to change drastically, either by acts of war or natural disasters on a cataclysmic scale that last way beyond many lifetimes.