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'''City-states''' are extremely small sovereign [[nation]]s, usually only containing a single city after which they are named. They were common in ancient [[Greece]], where they were referred to as ''poleis'' (singular ''polis'') and usually had a fair number of rivalries and political alliances, but would ban together during times of foreign threat.   

'''City-states''' are extremely small sovereign [[nation]]s, usually only containing a single city after which they are named. They were common in ancient [[Greece]], where they were referred to as ''poleis'' (singular ''polis''), and usually had a fair number of rivalries and political alliances, but would ban together during times of foreign threat.   

Historic examples include [[Sparta]], [[Athens]] and [[Corinth]]. Their infighting, along with the infighting of other Greek city-states, was infamous, but so was their ability to ban together to defeat the [[Persian empire|Persians]] when that great empire sought to absorb Greece.

Historic examples include [[Sparta]], [[Athens]] and [[Corinth]]. Their infighting, along with the infighting of other Greek city-states, was infamous, but so was their ability to ban together to defeat the [[Persian empire|Persians]] when that great empire sought to absorb Greece.