Columbia subject headings:
Free trade--Mexico.
Free trade--United States.
Mexico--Foreign economic relations--United States.
North American Free Trade Agreement
United States--Foreign economic relations--Mexico.
United States--Foreign relations--1993-2001.
Harvard subject headings:
Free trade--Canada
Free trade--Mexico
Free trade--United States
Mexico--Foreign economic relations--United States.
United States--Foreign economic relations--Mexico.
United States--Foreign relations--1993-2001.
Princeton subject headings:
Free trade--Mexico.
Free trade--United States.
Mexico--Foreign economic relations--United States.
North American Free Trade Agreement
United States--Foreign economic relations--Mexico.
United States--Foreign relations--1993-.