Will give ! answer the following what was the main effect of the peloponnesian war? a. athens defeated sparta and its allies and spread democracy beyond the borders of ancient greece. b. athens crushed sparta after the war, keeping its status as the city-state with the most powerful navy. c. sparta emerged as the superpower of ancient greece, and the spartans took over the government of athens. d. the city-states weakened considerably due to the war, making them vulnerable to foreign attacks. e. other city-states took on the democratic system of government introduced in athens.