Columbia subject headings:
Social action--United States--History.
Social change--Case studies.
Social reformers--United States--History.
United States--Social conditions.
Harvard subject headings:
Social action--United States--History.
Social change--Case studies
Social reformers--United States--History.
United States--Social conditions.
Princeton subject headings:
Case studies.
Social action--United States--History.
Social change--Case studies.
Social reformers--United States--History.
United States--Social conditions.