Columbia subject headings:
Mexico--History.
Mexico--Politics and government.
Mexico--Social conditions.
Harvard subject headings:
Mexico--History.
Mexico--Politics and government
Mexico--Social conditions.
Princeton subject headings:
Mexico--Economic conditions--19th century.
Mexico--Economic conditions--20th century.
Mexico--History--19th century.
Mexico--History--20th century.
Mexico--Social conditions--19th century.
Mexico--Social conditions--20th century.