sentences:  Socialist Soviet Republic of Abkhazia
  
  The Socialist Soviet Republic of Abkhazia (SSR Abkhazia) was a short-lived republic within the Caucasus region of the Soviet Union that covered the territory of Abkhazia, and existed from 31 March 1921 to 19 February 1931.Formed in the aftermath of the Red Army invasion of Georgia in 1921, it was independent until 16 December 1921, when it agreed to a treaty uniting it with the Georgian Soviet Socialist Republic (Georgian SSR).