The Peloponnesian War changed Greece in every way. This conflict was called the Peloponnesian War. The Peloponnesian War changed the face of the ancient Greek world. The war was fought between the Peloponnesian League (led by Sparta) and the Athenian league (led by Athens). ... Because of the unity and Greek identity developed as a result of the Persian Wars, which Herodotus recounst in Book 8 - this unity has been dismantled. Historians have traditionally divided the war … Finally, in 431 B.C., Sparta declared war on Athens. Sparta headed a league of city-states to stand up to the power of the Delian League. Historians have traditionally divided the war into three phases. Democracy in Athens was briefly overthrown in 411 BCE as a result of its poor handling of the Peloponnesian War. The war lasted more than 20 years. The Peloponnesian War was a protracted conflict amongst the city-states of Classical Greece. The Peloponnesian War (431–404 BC) was an ancient Greek war fought by Athens and its empire against the Peloponnesian League led by Sparta. Nothing was the same after the war, and Athens was never to be as powerful. B. Greece became more disunited and open to invasion C. Led to Greek Golden Age D. Sparta unified Greece - the answers to Athens, the once superpower, was taken down and was no longer a powerhouse. The costly war wasn’t just costly for Athens and Sparta – all of Greece bore … This greatly alarmed Sparta and its allies. Athenian expansion as a cause of the Peloponnesian War - Athens attempted to impose its power on other city states. The Peloponnesian War (431–404 BC) was an ancient Greek war fought by the Delian League led by Athens against the Peloponnesian League led by Sparta. It is called the Peloponnesian League because many of the city-states were located on the Peloponnesus. Sparta was established as the leader. The Peloponnesian War ended in victory for Sparta and its allies, but signaled the demise of Athenian naval and political hegemony throughout the Mediterranean. The causes of the war are that the Athenian Empire upset the Greek world's balance of power. Why did hostilities break out into the open again? Answer: 2 question The result of the peloponnesian war was that A. Persia won the war. Innovations in Warfare. Like all great conflicts, the Peloponnesian War brought about changes and developments in warfare. The Peloponnesian War (431–404 BC) was actually the second war fought between Athens and Sparta in the fifth century. The reflections of the Greek general and historian Thucydides on this question in his History of the Peloponnesian War constitute one of the greatest books of all time. The History of the Peloponnesian War tells the story of the Peloponnesian War in Ancient Greece.It was written by Thucydides, an Athenian general who served in that war.