Republics of the Soviet Union
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The Republics of the Union of Soviet Socialist Republics or the Union Republics were national-based administrative units of the Union of Soviet Socialist Republics. Wikipedia
Government: One-party socialist republics
Created: 30 December 1922
Number: 21 (as of 1933)
Populations: Smallest: 1,565,662 (Estonian SSR); Largest: 147,386,000 (Russian SFSR)
Location: Soviet Union
Abolished: 26 December 1991