dec 30, 1922 - Creation of the Soviet Union

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The Treaty on the Creation of the USSR along with the Declaration of the Creation of the USSR was approved on 30 December 1922 by a conference of delegations from the Russian SFSR, the Transcaucasian SFSR, the Ukrainian SSR and the Byelorussian SSR. The Treaty and the Declaration were confirmed by the 1st Congress of Soviets of the USSR and signed by heads of national delegations. The treaty provided flexibility to admit new members. Thus, by 1940 the Soviet Union grew from the founding four to fifteen republics.

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