How did sparta defeat athens at the end of the peloponnesian war?

The Peloponnesian Wars fought between Athens and Sparta and their respective allies came in two stages,  With battles occurring at home and abroad, the long and complex conflict was damaging to both sides but Sparta, with financial help from Persia, finally won the conflict by destroying the Athenian fleet at Aegospotami.

When Napoleon came to power in France, his control expanded all across the World as he conquered or allied himself with almost every European nation (excluding Great Britain). This power put Napoleon in a position of great authority and enabled him to bring about wide-reaching social, economic, and political changes.

(I don't know if this will help)

Explanation: