Red Army invasion of Azerbaijan in the context of "Azerbaijan Democratic Republic"

The Azerbaijan Soviet Socialist Republic, also referred to as the Azerbaijani Soviet Socialist Republic, Azerbaijan SSR, Azerbaijani SSR, AzSSR, Soviet Azerbaijan or simply Azerbaijan, was one of the constituent republics of the Soviet Union between 1922 and 1991. Azerbaijan SSR was created on 28 April 1920 following the Red Army invasion of Azerbaijan. When the Russian Soviet Federative Socialist Republic brought pro-Soviet figures to power in the region, the first two years of the Azerbaijani SSR were as an independent country until incorporation into the Transcaucasian SFSR, along with the Armenian SSR and the Georgian SSR.

In December 1922, the Transcaucasian SFSR became part of the newly established Soviet Union. The Constitution of Azerbaijan SSR was approved by the 9th Extraordinary All-Azerbaijani Congress of Soviets on 14 March 1937. On 5 February 1991, Azerbaijan SSR was renamed the Republic of Azerbaijan according to the Decision No.16-XII of Supreme Soviet of Azerbaijan approving the Decree of the President of Azerbaijan SSR dated 29 November 1990, remained in the USSR for the period before the declaration of independence in October 1991. The Constitution of the Azerbaijan SSR ceased to exist in 1995, upon the adoption of the new Constitution of Azerbaijan.

The Muslim uprisings in Kars and Sharur–Nakhichevan were a series of insurgencies by local Muslims against the administration of the First Republic of Armenia, beginning on 1 July 1919 and ending 28 July 1920. The areas of uprising were persuaded into insurrection by the sedition of Turkish and Azerbaijani agents who were trying to destabilise Armenia in order to form a pan-Turkic corridor between their nations.

Following the withdrawal of the Ottoman army from the South Caucasus, local Muslims in the formerly occupied areas were armed and assisted in establishing political states with the aim of resisting reincorporation into Armenia. In the spring of 1919, the British command in the Caucasus assisted Armenia in defeating these statelets; however, some months later due to the efforts of Turkish and Azerbaijani emissaries, Armenian administration collapsed and the region fell under local control again until the Armenian counteroffensive in the summer of 1920. The Armenian campaign to reabsorb the Nakhichevan region was halted by the forces of Soviet Russia who had invaded Azerbaijan earlier in the year. The Kars region was briefly reincorporated into Armenian governance until it was conquered by Turkish forces by the end of the Turkish–Armenian war in December 1920.

Sergo Konstantinovich Ordzhonikidze (born Grigol Konstantines dze Orjonikidze; 24 October [O.S. 12 October] 1886 – 18 February 1937) was an Old Bolshevik and a Soviet statesman.

Born and raised in Georgia, in the Russian Empire, Ordzhonikidze joined the Bolsheviks at an early age and quickly rose within the ranks to become an important figure within the group. Arrested and imprisoned several times by the Russian police, he was in Siberian exile when the February Revolution began in 1917. Returning from exile, Ordzhonikidze took part in the October Revolution that brought the Bolsheviks to power. During the subsequent Civil War he played an active role as the leading Bolshevik in the Caucasus, overseeing the invasions of Azerbaijan, Armenia, and Georgia. He backed their union into the Transcaucasian Socialist Federative Soviet Republic (TSFSR), which helped form the Soviet Union in 1922 and served as the First Secretary of the TSFSR until 1926.