Columbia subject headings:
National characteristics, American.
United States--Civilization--1945-
Harvard subject headings:
Civilization, Modern--American influences
National characteristics, American.
United States--Civilization--20th century.
United States--History--20th century.
United States--Relations.
Princeton subject headings:
Civilization, Modern--American influences.
National characteristics, American.
United States--Civilization--20th century.
United States--History--20th century.
United States--Relations.