The draft declaration was endorsed on 29 December 1922, by a conference of plenipotentiary delegations from the Russian SFSR, the Ukrainian SSR, Byelorussian SSR, and the Transcaucasian SFSR. On 30 December 1922, the declaration together with the Treaty on the Establishment of the USSR was adopted by the First Congress of Soviets of the USSR. It was included as preamble in the Constitution of the USSR of 1924.