In post-revolutionary Russia, the Union of Soviet Socialist Republic
(USSR) was established, comprising a confederatio  of Russia,
Belorussia, Ukraine and the Transcaucasian Federation (divided
in 1936 into the Georgian, Azerbaijan and Armenian republics). Also
known as the Soviet Union, the new communist state was the
successor to the Russian Empire and the first country in the
world to be based on Marxist socialism.

Lenin Proclaims Soviet Power in Smolny Palace.