Columbia subject headings:
Black people--Africa--Economic conditions--21st century.
Black people--Africa--Social conditions--21st century.
Middle class--Africa--Congresses.
Social classes--Africa.
Social structure--Africa--Congresses.
Working class--Africa--Congresses.
Harvard subject headings:
Middle class--Africa--Congresses.
Social structure--Africa--Congresses.
Princeton subject headings:
Black people--Africa--Economic conditions--21st century.
Black people--Africa--Social conditions--21st century.
Middle class--Africa--Congresses.
Social classes--Africa.
Social structure--Africa--Congresses.
Working class--Africa--Congresses.