Columbia subject headings:
Social action.
Social change.
United States--Social conditions--1980-2020.
United States--Social policy.
Harvard subject headings:
Social action
Social change
United States--Social conditions--1960-1980
United States--Social conditions--1980-2020
United States--Social policy
Princeton subject headings:
Social action.
Social change.
United States--Social conditions--1960-.
United States--Social policy.