An empire (from the Latin "imperium", denoting military command within the ancient Roman government) is a state that extends dominion over populations distinct culturally and ethnically from the culture/ethnicity at the center of power. Scholars still debate about what exactly constitutes an empire, and other definitions may emphasize economic or political factors. Like other states, an empire maintains its political structure at least partly by coercion. Land-based empires (such as the Mongol Empire or the Achaemenid Persia) tend to extend in a contiguous area; sea-borne empires, also known as thalassocracies (the Athenian, Portuguese and the British empires provide examples), may feature looser structures and more scattered territories. Empires predate the Romans by dozens of centuries: for example, the Akkadian Empire of Sargon of Akkad was the earliest model of a far-flung, land-based empire, founded in the 24th century BC

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