Social Studies
EdithTufte
14

which geographic feature served as a barrier to political unity and encouraged the rise of independent city-states in acient greece

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Ray014

I would say that this was a combination of two features: the fact that Greece is mountainous ( I think this is the major reason) so the cities were located in valleys that  were not easily accessible from other valleys, and that there were many islands These both features made communication more difficult and defense easier.

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