In international relations, regional hegemony is the influence exercised over neighboring countries by an independently powerful nation, the regional hegemon. The relationship between regional hegemons and the other states within their spheres of influence is analogous to the relationship between a global hegemon and the other states in the international system. The prominent international relations scholar John Mearsheimer writes extensively about the pursuit of regional hegemony in his book, The Tragedy of Great Power Politics. According to his theory, known as offensive realism, the anarchic nature of the international system, the desire for survival, and the uncertainty about other states' intentions ultimately lead states to pursue regional hegemony. According to Mearsheimer, global hegemony is an unattainable goal; instead, a state which has achieved the level of regional hegemon will then work to prevent the development of peer competitors in other regions.

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