Columbia subject headings:
Authority--History--20th century.
Social engineering--United States--History--20th century.
United States--Social conditions.
Harvard subject headings:
Authority--History--20th century.
Democracy--History--20th century
Social engineering--United States--History--20th century.
United States--Social conditions.
Princeton subject headings:
Authority--History--20th century.
Democracy--History--20th century.
Social engineering--United States--History--20th century.
United States--Social conditions.