A reason to leave a place
The main problems of evidence in dealing with early civilizations is that much of the potential evidence itself--such as tools, homes, etc--has vanished due to the fact that it was made of materials such as clay that could not withstand the test of time and weather.
It's roads to connect different parts of their empire. Just finished the test :)
<span>Its major advantage was that the allies had to cross a river to get to them.
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