This article is about the state of the Soviet Union. For the magazine of the same name, see Soviet Union (magazine).

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The Soviet Union (short SU, full official name: Union of Soviet Socialist Republics, short USSR, Russian СоюзAudio-Datei / Hörbeispiel Советских Социалистических Республик (СССР)? /i Soyuz Sovietskich Socialistitscheskich Respublik (SSSR)) was a centrally governed, federal, one-party state whose territory stretched across Eastern Europe and the Caucasus to Central Asia and throughout Northern Asia. It was founded on 30 December 1922 by the Bolsheviks and dissolved by the Alma-Ata Declaration on 21 December 1991 as a union consisting of 15 union republics. The rights and obligations under international law in international organizations have since been exercised by the Russian Federation.

The core territory (with 78% of the area in 1990) consisted of the Russian Soviet Republic (RSFSR), which had emerged from the core of the Tsarist Empire in the course of the October Revolution on 7 November 1917 and to which, as an independent Russian Federation, its "thread of connection with the outside world passed" after the dissolution of the Union. The RSFSR, unlike the other former Soviet republics, had not previously issued a declaration of independence on its part, which should not be confused with the Russian Federation's "Declaration of State Sovereignty" of 12 June 1990, now celebrated as "Russia Day".

Because of the dominance of the Russian Soviet Republic, the Soviet Union was often linguistically inaccurately or as a rhetorical figure of pars pro toto simplified equated in Western countries with the historical Russia before 1917 or also referred to as so-called Soviet Russia. The Soviet citizens were falsely referred to as "Russians" as a generalization.