Columbia subject headings:
Political participation--Southern Cone of South America--History--20th century.
Revolutions--Southern Cone of South America--History--20th century.
Social movements--Southern Cone of South America--History--20th century.
Southern Cone of South America--Politics and government--20th century.
Harvard subject headings:
Political participation--Southern Cone of South America--History--20th century.
Revolutions--Southern Cone of South America--History--20th century.
Social movements--Southern Cone of South America--History--20th century.
Southern Cone of South America--Politics and government--20th century.
Princeton subject headings: