Answer: The war has weakened all city-states in the next 50 years
Explanation: The conflict between Athens, on the one hand, and Sparta and its allies on the other, was created for the reason of Athens' domination over the other city-states and the fear of Sparta from Athens' domination. The growing influence and power of Athens has increasingly provoked instability in the region. Thus, this conflict turned out to be the Peloponnesian War (431 - 404 BC). The victory was taken by Sparta and its allies, reducing both the power and influence of Athens, as well as the model of Athens democracy. Even the Athenians were forced after the defeat of Sparta to replace democracy with the oligarchy, a type of rule similar to the Spartan. Also, this long exhausting war reflects on all Greek city-states by significantly weakening them in the period of the next 50 years.