Outside invasions and problems from within, spell the end for most cities civilizations city-states

City-States

Explanation:

They are considering the end for most city-states because those problems, issues and outside invasions can be very harmful to city-states. Why?

Because they are independent countries that have self-governing. Nowadays, there are only a few city-states. In the past, city-states were, for example, Rome, Athens, Sparta, and those cities can best describe what the city-state is and why issues are harmful for them.

answer; traditional culture;

answer; (regions)