Columbia subject headings:
Middle class--United States--History.
Success--United States.
United States--Social life and customs.
Harvard subject headings:
Middle class--United States--History--20th century.
Middle class--United States--History.
Success--United States
Success--United States--History--20th century.
United States--Social life and customs--20th century.
United States--Social life and customs.
Princeton subject headings:
Middle class--United States--History.
Success--United States.
United States--Social life and customs.