They were created so they defend there self when attackers come
Greek city-states
Yes.
Yes.
Yes they did they had many wealthy cultires amd helped other city-states
Because they had not expanded their economy outside their country, they created an internal economy because all of the city-states had a separate "specialty".
They created a civilization of city-states
They owned a tract of agricultural land to support themselves, created a defensive citadel, around which developed a city. They were independent, and so were city-states.
the city states
He created alliances with many greek city-states
Vatican City was created by the Lateran Treaty in 1929 between the Italian monarchy and Pope Pius IX as an independent nation. Prior to that, the Vatican was simply part of the city of Rome and before that it was part of the Papal States.
Washington, DC (District of Columbia), the United States' capital.
a political system based on independent city-states