The collapse of these empires where to a very large extents the turning points that were experienced in human history.
This is the term that was used in the olden world to refer to the control of a particular area by a leader that is seen or called the emperor of the place. These areas were known to have been controlled solely by the emperors.
The fall of these empires affected history because it brought about certain changes that had to do with the separation of powers in the governments. It brought about new systems of governments and the people got to be faced with new leaders.
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