U.S. President Bill Clinton signs the North Americ [Getty Images]

WASHINGTON, : U.S. President Bill Clinton signs the North American Free Trade Agreement (NAFTA) 08 December 1993 as, from left, Vice President Al Gore, House Minority Leader Bob Michel, R-Ill., and Speaker of the House Tom Foley, D-Wash., watch. The controversial pact will phase out tariffs between the U.S., Mexico, and Canada. (Photo credit should read PAUL J. RICHARDS/AFP via Getty Images)

AFP PAUL J. RICHARDS