Columbia subject headings:
Harvard subject headings:
Civilization, Modern--20th century
History, Modern--1945-1989
History, Modern--1989-
World politics--1945-
Princeton subject headings:
Chronology, Historical.
Civilization, Modern--20th century.
History, Modern--1945-1989.
History, Modern--1989-
World politics--1945-1989.
World politics--1989-