On March 4, Soviet power was established in Sukhumi, with the formation of the Abkhazian Soviet Socialist Republic (Abkhazian SSR), subsequently recognized by the newly established Communist regime of the Georgian SSR on May 21. On December 16, however, Abkhazia signed a special "union treaty" delegating some of its sovereign powers to Soviet Georgia. Abkhazia and Georgia together entered the Transcaucasian SFSR on December 13, 1922 and on 30 December joined the Union of Soviet Socialist Republics. Abkhazia's ambiguous status of "Union Republic" was written into that republic's April 1, 1925 constitution. Paradoxically, an earlier reference to Abkhazia as an autonomous republic in the 1924 Soviet Constitution remained unratified until 1930 when Abkhazia's status was reduced to an Autonomous Soviet Socialist Republic (ASSR) within the Georgian SSR. Except for a few nobles, the Abkhaz did not participate in the 1924 August Uprising in Georgia, a last desperate attempt to restore the independence of Georgia from the Soviet Union.