Columbia subject headings:
Mexico, North--Economic conditions--Congresses.
Mexico, North--Social conditions--Congresses.
Mexico--Commercial policy--Congresses.
Harvard subject headings:
Mexico, North--Economic conditions--Congresses.
Mexico, North--Social conditions--Congresses.
Mexico--Commercial policy--Congresses.
Princeton subject headings:
Mexican-American Border Region--Economic conditions--Congresses.
Mexico, North--Commerce--United States--Congresses.
United States--Commerce--Mexico, North--Congresses.