Договор об образовании СССР
On 30 December 1922, the First Congress of the Soviets of the USSR approved the Treaty on the Creation of the USSR, by which Russia was united with the Ukrainian Soviet Socialist Republic, Byelorussian Soviet Socialist Republic and Transcaucasian Soviet Federal Socialist Republic into a single federal state, the Soviet Union. The treaty was included in the 1924 Soviet Constitution, adopted on 31 January 1924 by the Second Congress of Soviets of the USSR.