Columbia subject headings:
Democracy--Europe.
Europe--Politics and government--20th century.
Socialism--Europe.
Harvard subject headings:
Democratization--Europe--History--20th century.
Europe--Politics and government--20th century
Nation-state--History--20th century.
Socialism--Europe--History--20th century
Princeton subject headings:
Democratization--Europe--History--20th century.
Europe--Politics and government--20th century.
Nation-state--History--20th century.
Socialism--Europe--History--20th century.