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In page International relations:

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policies of sovereign city states have been done in ancient times, as in Thucydides' analysis of the causes of the Peloponnesian War between Athens and Sparta,[2] as well as by Niccolò Machiavelli in The Prince, published in 1532, where he analyzed the foreign policy of the renaissance city state of Florence.[3] The contemporary field of international relations, however, analyzes the connections existing between sovereign nation-states. This makes the establishment of the modern state system the natural starting point of international relations history.[citation needed]