USSR - Union of Soviet Socialist Republics (1922-1991)
"The Union of Soviet Socialist Republics (the USSR or the Soviet Union, the Union of Soviet Socialist Republics, the USSR written in Cyrillic as Сою́з Сове́тских Социалисти́ческих Респу́блик) was the Union of Socialist Republics, which existed from 1922 to 1991. The list of countries in the Soviet Union is over time changed; In recent years it has consisted of 15 Soviet Socialist Republics (SSR). Russia was by far the largest republic in the USSR and prevailed in almost all respects: in terms of surface, population, economy and political influence. The extent of the territory of the Soviet Union has also changed, and in recent times it has roughly coincided with the territory of imperial Russia without Poland and Finland. The political order of the country was dictated by the only recognized political party, the Communist Party of the Soviet Union."