To protect their own farms and businesses. They could only do this by combining to generate the necessary force.
As the upper class needed this cooperation, they were obliged progressively to accept a general assembly of the citizens, which opened the way to developing democracy.
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In order to survive, all city-states had to train their male citizens as warriors as they achieved adulthood.
Yes, otherwise called a "polis". Sparta had its own form of governance and a distinct citizen body.
The soldiers in most cases (such as Sparta) were already determining the role of their city-states in Greece. Some other, besides Sparta, sought to make the soldiers the primary political power, because of their importance to maintaining the independence of the city.It was only after repeated conquests by Persia, and then by Philip II of Macedon, that any sense of continuing unity was achieved among the disparate cities of Greece. This was not enough to prevent their conquest by the Romans.They were farmers, and wanted to protect their land and crops from both invading nomads and adjacent city states seeking to pirate their land.Other answers include:More power in the governmentFree weapons
A member of a city-state or polis who was not a slave or resident alien was called a citizen. In ancient Greece, citizens were an elite group which did not include women, peasants, slaves, and resident aliens. It was a hereditary status.
The city of soldiers