section_path: Politics and society/Political structure
section_name: Political structure
paragraph_text: Political structure
  
  Ancient Greece consisted of several hundred relatively independent city-states (poleis). This was a situation unlike that in most other contemporary societies, which were either tribal or kingdoms ruling over relatively large territories. Undoubtedly, the geography of Greece —divided and sub-divided by hills, mountains, and rivers—contributed to the fragmentary nature of ancient Greece. On the one hand, the ancient Greeks had no doubt that they were "one people"; they had the same religion, same basic culture, and same language. Furthermore, the Greeks were very aware of their tribal origins; Herodotus was able to extensively categorise the city-states by tribe. Yet, although these higher-level relationships existed, they seem to have rarely had a major role in Greek politics. The independence of the poleis was fiercely defended; unification was something rarely contemplated by the ancient Greeks. Even when, during the second Persian invasion of Greece, a group of city-states allied themselves to defend Greece, the vast majority of poleis remained neutral, and after the Persian defeat, the allies quickly returned to infighting.
  
  Thus, the major peculiarities of the ancient Greek political system were its fragmentary nature (and that this does not particularly seem to have tribal origin), and the particular focus on urban centers within otherwise tiny states. The peculiarities of the Greek system are further evidenced by the colonies that they set up throughout the Mediterranean, which, though they might count a certain Greek polis as their 'mother' (and remain sympathetic to her), were completely independent of the founding city.
  
  Inevitably smaller poleis might be dominated by larger neighbors, but conquest or direct rule by another city-state appears to have been quite rare. Instead the poleis grouped themselves into leagues, membership of which was in a constant state of flux. Later in the Classical period, the leagues would become fewer and larger, be dominated by one city (particularly Athens, Sparta and Thebes); and often poleis would be compelled to join under threat of war (or as part of a peace treaty). Even after Philip II of Macedon "conquered" the heartlands of ancient Greece, he did not attempt to annex the territory or unify it into a new province, but compelled most of the poleis to join his own Corinthian League.