What Caused The Peloponnesian War

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A major event in history of international relations is the Peloponnesian War. In 431 BCE, Greek City states Sparta and Athens went to war. According to Athenian general Thucydides the war was caused by changing power within each state. As each city state had strength in different areas of war, such as Athens had a strong navy and Sparta was infamous for their authoritative army the battle was long and gruesome. The war lasted for three decades, where the city state of Sparta was victorious by 404 BCE. During this war, Thucydides' was intrigued and was the first person to study and attempt to analyze how international politics works.

The level of analysis that caused this event to occur was state level of analysis. As Athens and Greece