The Roman Republic lasted from 509–59 BC.
The Roman Empire lasted from 59 BC to 476 AD, when the Vandals deposed the Emperor.
Temujin (Genghis) made Khan of Mongol Horde in 1183... the Empire begins to demishish in 1386.
The Macedonian Empire flourished under Alexander, but really didn't last more than 30 years (332 BC to 305 BC).
In 1299, the Ottomans began a vast empire which was lead by an unbroken chain of succesion via the House of Osman until 1922, when a loss in WWI ended the empire and began the modern Turkish state.
So, where exactly are you pulling this "great civilizations have collapsed around 200 years" thing from?
I think we still have a good amount of time left.
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