Columbia subject headings:
Harvard subject headings:
Free trade--Canada
Free trade--Mexico
Free trade--North America
Free trade--United States
North America--Commerce.
North America--Commercial policy.
Unemployment--United States
United States--Commercial policy.
United States--Commercial treaties.
United States--Economic policy--1993-2001.
Princeton subject headings:
Free trade--North America.
Free trade--United States--Economic aspects.
Free trade--United States--Social aspects.
North America--Commerce.