communism's superpower experiment
framing
1917–1918
1918–1921
1921–1924
1924–1929
1929–1933
1928–1941
1934–1939
1929–1941
1933–1941
1941–1942
1942–1945
1945–1953
1953–1957
1953–1964
1964–1982
1965–1982
1979–1985
1985–1989
1989–1991