What impact did the Peloponnesian War have on ancient Greece?

Question

A. The war brought the city-states into contact with other civilizations.
B. The war discouraged seafaring and promoted greater economic self-sufficiency.
C. The war encouraged the city-states to unite behind central rule.**
D. The war weakened ties among the city-states and made them vulnerable to attack.

Answer 1

http://www.livius.org/articles/concept/peloponnesian-war/