Answer:
Sparta
Step-by-step explanation:
The Peloponnesian War was one of the most important conflicts of antiquity. This war took place in Greece between the Delian League (led by Athens) and the Peloponnesian League (led by Sparta). The war was very significant because it changed the balance of power in Greece. Athens lost all of its power, and was greatly reduced in importance. On the other hand, Sparta became the leading power of Greece, gaining control of the whole territory for a short period of time.