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The Peloponnesian war began after the Persian Wars ended in 449 BCE. The two powers struggled to agree on their respective spheres of influence absent Persia's influence. This disagreement led to friction and eventually outright war. Additionally, Athens and its ambitions caused increasing instability in Greece. The profoundly different societies of Athens and Sparta was also a significant factor in the war’s outbreak, which also had an ideological aspect.

[[File: PEP THREE.jpg|thumbnail|left|300px|Statuette of a Spartan Warrior]]

The origins of the Peloponnesian War lay in Greece's victory over the Persian Empire. The Greeks had combined under the leadership of Sparta and Athens to defeat the Persians, then the most powerful empire in Asia. In the aftermath of the Persian Wars, the Greeks were unable to maintain their unity. Cultural and ethnic differences were driving the Greek world apart. People’s first loyalty was often to their Polis or local city.

Athens growing ambitions led to tensions with its neighbors and eventually led to a war. This conflict involved Athens and Corinth, with the latter receiving some support from Sparta. This war ended with a peace treaty and a ‘Thirty Years Peace.’ This treaty, in theory, guaranteed Athens and Sparta their respective spheres of influence. Corinth and other members of the Peloponnesian League were unhappy about Sparta’s lack of leadership. Some leading Spartans became concerned that their inaction would push the other major Greek powers, to side with Athens. During the so-called thirty Year Peace Athens grew ever stronger and in many ways arrogant, as seen in its increasing haughty attitude to its subject city-states.

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====How did the Peloponnesian War Start?====

The underlying cause of the war was the rapid rise of the Athenians. They had grown from just another city-state into an Empire. During and after the Persian Wars, it had transformed itself and became a major trading and maritime power.<ref>Cawkwell, George. <i>[https://www.amazon.com/gp/product/B000FA5ZGY/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B000FA5ZGY&linkCode=as2&tag=dailyh0c-20&linkId=b0d12599fc35ad97a1a071a79c90ab5e Thucydides and the Peloponnesian War]</i> (London: Routledge, 1997), p 67</ref> It had developed into the greatest maritime power in the Greek world and could dominate the trade routes in the eastern Mediterranean. It had emerged as a great Empire in a quick period, and this upset the traditional balance of power. For many decades’ Sparta, had been the greatest military power in Greece. Sparta's well-disciplined and much-feared army was the source of its military power. The Spartan Hoplite was considered the best soldiers in the Greek world.<ref>Hanson, Victor Davis. <i>[https://www.amazon.com/gp/product/0812969707/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0812969707&linkCode=as2&tag=dailyh0c-20&linkId=2988ca75b4a6858afae8101e8c5ce3d0 A War Like No Other: How the Athenians and Spartans Fought the Peloponnesian War]</i>. (New York: Random House, 2005), p. 56</ref>

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The profound cultural and political differences between the two great Greek powers contributed to the war. They had real difficulties understanding each other and this lead to mutual suspicions. Because of their different political systems and cultures, they were often ideologically opposed. Sparta favored the many oligarchies and distrusted the role of the common people in government. In contrast, Athens encouraged democracy and believed that it was the best form of government.<ref>Thucydides, <i>The Peloponnesian War</i> 1.67–71</ref> This ideological rivalry between Sparta and Athens did much to increase tensions in the run-up to the outbreak of the Peloponnesian War and was a contributing factor.

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The Athenians were extremely confident and they knew that as long as they had their navy and their ‘Long Walls’ that they could not be defeated even if they could not beat Sparta and her allies on the battlefield. This strategy was recommended by Pericles to the Athenians and was much praised by Thucydides. Sparta began to contemplate war but they seemed unwilling to formally declare war. Then the situation spun out of control when allies of Sparta attacked the allies of Athens. The Spartans came to believe that they had no choice but to go to war. In 431 BCE, the senior Spartan king led an army into the countryside around Athens and laid it waste. This was the start of the great Peloponnesian War. The early years of the war were a stalemate because according to Thucydides writings, this was because the Athenians followed Pericles cautious strategy.<ref>Thucydides, The Peloponnesian War 2.69–71</ref> Later Athens, encouraged by Alcibiades launched the Sicilian expedition to conquer Sicily during a lull in the fighting, known as the Peace of Nicias. This proved to be a disaster and it led to the loss of an Athenian army and navy. Remarkably, the Athenians continued to fight and the Spartans needed Persian help to defeat them.<ref>Thucydides, <i>The Peloponnesian War</i> 6.6–11</ref> The destruction of the Athenian fleet at Aegospotami ended the war, and Athens surrendered the following year. Athens was forced to tear down its Long Walls and was fortunate not to be utterly destroyed.

The Peloponnesian War changed Greece in every way. Nothing was the same after the war and Athens was never to be as powerful. The causes of the war, are that the Athenian Empire upset the balance of power in the Greek world. This greatly alarmed Sparta and its allies. The aggressive policies of Athens did not help the situation- the ambitions of the city-state certainly provoked the Spartans. Increasingly, the Spartans became very nervous about the growing naval and commercial power of Athens. At first, they resisted the calls of its allied to declare war on its arch-rival. Once Athens had issued the Megarian degree, it initiated a chain of event that led to the Spartan invasion of Athenian territory. The deep cultural differences between the two Greek powers was also a contributory factor to the increasing tensions that later exploded into an all-out war that consumed the entire Greek world.

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