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In page Hegemony:

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Rome established its hegemony over the entire Mediterranean after its victory over the Seleucid Empire in 189 BC. Officially, Rome's client states were outside the whole Roman imperium, and preserved their entire sovereignty and international rights and privileges.[1] Edward Luttwak, in The Grand Strategy of the Roman Empire,[2] outlined three stages, with hegemonic being the first, followed by imperial. In his view the transformation proved to be fatal and eventually led to the fall of the Roman Empire.[citation needed]