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Soviet Union - Wikipedia
Russian Soviet Federative Socialist Republic - Wikipedia
Republics of the Soviet Union - Wikipedia
Soviet Union | History, Leaders, Flag, Map, & Anthem | Britannica
What Countries Were Part of the Soviet Union? - HISTORY
Soviet Union - Revolution, Communism, USSR | Britannica
Soviet Union ‑ Countries, Cold War & Collapse | HISTORY
The Birth of the Soviet Union and the Death of the Russian …
collapse of the Soviet Union - Encyclopedia Britannica
What Was the USSR and Which Countries Were in It? - ThoughtCo