Prequel, 1955-1974
Emergence, growth, and consolidation, 1974-1986
Mainstreamers and ballots take the lead, 1987-1989
The end of anticommunism, 1900-1991
The movement matures, 1922-1993
Against the new world order, 1994-1996
Mainstreamers and vanguardists at century's end, 1997-2001
Prolegomena to the future, 2001-2004.