Columbia subject headings:
Mexico--Relations--United States.
United States--Politics and government--1993-2001.
United States--Relations--Mexico.
Harvard subject headings:
Mexico--Relations--United States.
United States--Politics and government--1993-2001.
United States--Relations--Mexico.
Princeton subject headings:
Mexico--Foreign relations--United States.
Mexico--Politics and government--1988-2000.
United States--Foreign relations--Mexico.
United States--Politics and government--1993-2001.