Azerbaijan (/ˌæzərbaɪˈdʒɑːn/ (listen) AZ-ər-by-JAHN; Azerbaijani: Азәрбајҹан / Azərbaycan), officially the Azerbaijan Soviet Socialist Republic (Azerbaijan SSR; Azerbaijani: Азәрбајҹан Совет Сосиалист Республикасы / Azərbaycan Sovet Sosialist Respublikası, Russian: Азербайджанская Советская Социалистическая Республика [АзССР], romanized: Azerbaydzhanskaya Sovetskaya Sotsialisticheskaya Respublika [AzSSR]), also referred to as Soviet Azerbaijan, was one of the constituent republics of the Soviet Union between 1922 and 1991. Created on 28 April 1920 when Soviet Russia 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 Transcausasian 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, remaining in the USSR for another period before its independence in October 1991. The Constitution of the Azerbaijan SSR ceased to exist in 1995, upon the adoption of the new Constitution of Azerbaijan.