Question

When did USSR came into being?​

Answer 1

Answer:

December 30, 1922

Explanation:

Following the 1917 Revolution, four socialist republics were established on the territory of the former empire: the Russian and Transcaucasian Soviet Federated Socialist Republics and the Ukrainian and Belorussian Soviet Socialist Republics. On December 30, 1922, these constituent republics established the U.S.S.R.