PBecause once upon a time.........it was the POPE who controlled a large swath of power......like a KING, which included large territories.
But over the years, and power shifts later........the Pope became less and less important, and more or less became boxed in, within Vatican City.......his last seat of Power. When Italy became a Unified Country..............they had to arrange a special deal with the POPE that left him in charge of his little area........a King, of sorts, within the Kings Kingdom. So they declared his little Popedom.......seperate , and allowed him to keep his little seat of Power.
Access to fresh water. you can always go without food but go without water and you won't getting nowhere
The Mediterranean Sea separated the Greek islands. These islands grew into separate city-states as they were separated by the sea.
The hills and mountains in Greece separated the individual city-states. These cities were separated by these hills and mountains, which led to them developing into different city-states.
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