CentralNotice From Wikipedia, the free encyclopedia Jump to navigation Jump to search Portal maintenance status: (June 2018) This portal's subpages have been checked by an editor, and are needed. Please take care when editing, especially if using automated editing software . Learn how to update the maintenance information here . Wikipedia portal for content related to Soviet Union Portal topics Activities Culture Geography Health History Mathematics Nature People Philosophy Religion Society Technology Random portal UNION OF SOVIET SOCIALIST REPUBLICS Introduction The flag of the Soviet Union The Soviet Union , officially the Union of Soviet Socialist Republics ( USSR ), was a socialist state that spanned Europe and Asia during its existence from 1922 to 1991. It was nominally a federal union of multiple national republics ; in pract...