The Soviet Union,. officially the Union of Soviet Socialist Republics. (USSR),. was a
transcontinental country that spanned much of
Eurasia
Eurasia (, ) is the largest continental area on Earth, comprising all of Europe and Asia. Primarily in the Northern and Eastern Hemispheres, it spans from the British Isles and the Iberian Peninsula in the west to the Japanese archipelago a ...
from 1922 to 1991. A flagship
communist state
A communist state, also known as a Marxist–Leninist state, is a one-party state that is administered and governed by a communist party guided by Marxism–Leninism. Marxism–Leninism was the state ideology of the Soviet Union, the Comint ...
, it was nominally a
federal union of
fifteen national republics; in practice, both
its government and
its economy were highly
centralized
Centralisation or centralization (see spelling differences) is the process by which the activities of an organisation, particularly those regarding planning and decision-making, framing strategy and policies become concentrated within a particu ...
until its final years. It was a
one-party state
A one-party state, single-party state, one-party system, or single-party system is a type of sovereign state in which only one political party has the right to form the government, usually based on the existing constitution. All other parties ...
governed by the
Communist Party of the Soviet Union
"Hymn of the Bolshevik Party"
, headquarters = 4 Staraya Square, Moscow
, general_secretary = Vladimir Lenin (first) Mikhail Gorbachev (last)
, founded =
, banned =
, founder = Vladimir Lenin
, newspaper ...
, with the city of
Moscow
Moscow ( , US chiefly ; rus, links=no, Москва, r=Moskva, p=mɐskˈva, a=Москва.ogg) is the capital and largest city of Russia. The city stands on the Moskva River in Central Russia, with a population estimated at 13.0 million ...
serving as its capital as well as that of its largest and most populous republic: the