It made city-states ununited, since they formed independently from each other. City-States were constantly fighting and going to war with each other.
Explanation:
Since city-states had distance between them, they adopted different lifestyles from one another; their economies depended on different recourses because their terrain was different from one another (ex: states by the coast would often fish as a main source of income and food). The mountanous terrain of Greece only separated city-states further and encouraged the independent growth of city-states. This meant Greece was ununited and city-states would constantly go to war with each other.
