Which of the following best describes the downfall of Greek city states

There is a debate among historians about the exact reasons for the downfall of Greek city-states, but some of the main factors that are commonly cited include:

1. Constant warfare and internal strife: The Greek city-states were often engaged in military conflicts with one another, leading to a state of almost perpetual warfare. This constant fighting drained resources and weakened the city-states' ability to govern effectively.

2. Economic decline: The Greek city-states relied heavily on trade and agriculture for their economy, and several factors, such as decreasing agricultural production, trade disruptions, and the sacking of cities during wars, contributed to economic decline.

3. Political instability: Many Greek city-states were oligarchies or democracies that were often plagued by internal divisions and power struggles. This political instability led to frequent changes in government and hindered effective decision-making.

4. External invasions: The Greek city-states were often invaded and conquered by foreign powers, such as the Persians, Macedonians, and Romans. These invasions weakened the city-states and eventually led to their subjugation.

Overall, the downfall of the Greek city-states can be attributed to a combination of internal factors like warfare, economic decline, and political instability, as well as external invasions by foreign powers.