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Republics of the Soviet Union - Wikipedia
Soviet Union | History, Leaders, Flag, Map, & Anthem
What Countries Were Part of the Soviet Union? - HISTORY
Soviet Union - Wikipedia
Soviet Union ‑ Countries, Cold War & Collapse | HISTORY
The complete list of Soviet republics - Russia Beyond
Former Soviet Union (USSR) Countries - WorldAtlas
Post-Soviet states - Wikipedia
Union of Soviet Socialist Republics summary - Encyclopedia Britannica
What Was the USSR and Which Countries Were in It? - ThoughtCo