Answer: 1922
Some extra relevant information:
The Soviet Union, officially known as the Union of Soviet Socialist Republics (USSR), was formally established on December 30, 1922. This date marks the consolidation of various Soviet republics, including Russia, Ukraine, Belarus, and others, into a single entity. The establishment of the USSR marked the end of the Russian Civil War and the beginning of a new era in history. Led by Vladimir Lenin and the Bolshevik Party, the Soviet Union went on to become one of the world’s major superpowers until its dissolution in December 1991. Throughout its existence, the Soviet Union played a significant role in shaping global politics, economy, and ideology.