Columbia subject headings:
Harvard subject headings:
Cities and towns--Social conditions--History.
Cities and towns--United States.
Migration, Internal--United States--History.
Occupational mobility--United States--History.
Social conflict--United States--History.
Social mobility--United States--History.
Princeton subject headings:
Cities and towns--Social conditions.
Cities and towns--United States.
Migration, Internal--United States--History.
Occupational mobility--United States--History.
Social mobility--United States--History.