Definition
An empire is a state with politico-military dominion of populations who are culturally and ethnically distinct from the imperial (ruling) ethnic group and its culture — unlike a federation, an extensive state voluntarily composed of autonomous states and peoples.
What physically and politically constitutes an empire is variously defined. It might be a state effecting imperial policies, or a particular political structure. Empires are typically formed from separate components that come together. Some units include ethnic, national, cultural, and religious diversity.
Sometimes an empire is a semantic construction, such as when a ruler assumes the title of "Emperor". The said ruler's nation logically becomes an "Empire", despite having no additional territory or hegemony such as Central African Empire or the Korean Empire proclaimed in 1897 when Korea, far from gaining new territory, was on the verge of being annexed by the Empire of Japan, the last to use the name officially. Amongst the last of these empires of the 20th century were the Central African Empire, Ethiopia, Vietnam, Manchukuo, the German Empire, and Korea.
The terrestrial empire's maritime analogue is the thalassocracy, an empire comprising islands and coasts which are accessible to its terrestrial homeland, such as the Athenian-dominated Delian League.
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