How does the ROman empire work?
http://encarta.msn.com/encyclopedia_1741502785/Roman_Empire.html
It worked for several centuries, but not anymore. Recommended reading (or viewing): I, Claudius. The HBO Series "Rome" makes a watchable soap opera out of the BC period of the Empire.
The Roman Empire was replaced by the "Holy Roman Empire", which didn't work very well either.
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what is the importance of ancient empire