Columbia subject headings:
Harvard subject headings:
Equality--Cross-cultural studies.
Equality--North America--History.
North America--Race relations--History.
Race discrimination--Cross-cultural studies.
Race discrimination--North America--History.
Race relations--Cross-cultural studies.
Social classes--Cross-cultural studies.
Social classes--North America--History.
Princeton subject headings:
Equality--Cross-cultural studies.
Equality--North America--History.
North America--Race relations--History.
Race discrimination--Cross-cultural studies.
Race discrimination--North America--History.
Race relations--Cross-cultural studies.
Social classes--Cross-cultural studies.
Social classes--North America--History.