Final answer:
After the Bolshevik Revolution in 1921, Russia changed its name to the Union of Soviet Socialist Republics (USSR)
Step-by-step explanation:
After the Bolshevik Revolution in 1921, Russia changed its name to the Union of Soviet Socialist Republics (USSR). The capital city was moved from St. Petersburg to Moscow, and St. Petersburg was renamed Petrograd and then Leningrad in honor of Vladimir Lenin. The entire territory of the Russian Empire became part of the new socialist state.