Azərbaycan Sosialist Sovet Respublikası
The Azerbaijan SSR was established on 28 April 1920 after the surrender of the government of the Azerbaijan Democratic Republic to local Bolsheviks led by Mirza Davud and Nariman Narimanov and the invasion of the Bolshevik 11th Red Army.
On 13 October 1921, the Soviet republics of Russia, Armenia, Azerbaijan, and Georgia signed an agreement with Turkey known as the Treaty of Kars. The previously independent Naxicivan SSR would also become an autonomous ASSR within Azerbaijan by the Treaty of Kars.
Borders of Azerbaijan and Armenia, like elsewhere in the USSR, were redrawn several times, yet neither side was completely satisfied with the results.
On 12 March 1922 the leaders of Azerbaijan, Armenian, and Georgian Soviet Socialist Republics established a union known as the Transcaucasian Soviet Federal Socialist Republic (TSFSR). This was the first attempt at a union of Soviet republics, preceding the USSR. The Union Council of TSFSR consisted of the representatives of the three republics – Nariman Narimanov (Azerbaijan), Polikarp Mdivani (Georgia), and Aleksandr Fyodorovich Miasnikyan (Armenia).
In December 1922 TSFSR agreed to join the union with Russia, Ukraine and Belarus, thus creating the Union of Soviet Socialist Republics which would last until 1991. The TSFSR, however, did not last long. In December 1936, the Transcaucasian Union was finally dismantled when the leaders in the Union Council found themselves unable to come to agreement over several issues. Azerbaijan, Armenia, and Georgia then became union Republics of the Soviet Union directly.