Why are there so few city-states?

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Here's a direct link to "Planning Ancient Rome": https://watchnebula.com/videos/city-b...

Resources:

A. The primary source for this video is: Parker, G. (2004). Sovereign city: the city-state through history. Reaktion Books.
B. https://www.un.org/development/desa/e...

Produced by Dave Amos in sunny Sacramento, California.
Edited by Eric Schneider in cloudy Cleveland, Ohio.