Answer :
Greek society saw an influx of ideas on how to govern and the idea that led to the downfall of the Greek system was:
- D. Each system formed its own nations.
The Greeks are a people that is well known for their naval strength and democracy which is considered as one of their major contribution to the world.
However, the idea which led to the downfall of Greece is the fact that they were divided into city-states and each system formed their own nations which made it difficult for them to unite against a common enemy.
Therefore, the correct answer is option D
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