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In page City-state:

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In the 20th century West Berlin, though lacking sovereignty, functioned from 1948 until 1990 as a state legally not belonging to any other state, but ruled by the Western Allies. They allowed – notwithstanding their overlordship as occupant powers – its internal organisation as one state simultaneously being a city, officially called Berlin (West). Though West Berlin maintained close ties to the West German Federal Republic, it never legally formed a part of it.[citation needed]