Soviet republic proclaimed in 1919 during the Russian Civil War (nominally independent satellite of the Russian SFSR until 1922); a founding constituent republic of the USSR from 1922, governing most of present-day Ukraine.
Declared independence as Ukraine on 24 August 1991, confirmed by referendum on 1 December 1991.
The atlas holds 5 border frames for Ukrainian Soviet Socialist Republic — the shape you scrub through changes in 1919 · 1939 · 1944 · 1945 · 1954.
Standard scholarly survey covering the Ukrainian SSR period in full alongside the rest of Ukraine's history; used as a verified fallback since no dedicated Ukrainian-SSR-only monograph surfaced.