Since the North American Free Trade Agreement ( NAFTA ) went into effect on January 1 , 1994 , relations between Canada , Mexico and the United States have significantly strengthened politically , economically , socially and culturally . During the Fox administration , a further integration towards Mexico 's northern neighbors was a top priority . The September 11 attacks changed the priorities of U.S. foreign policy toward the strengthening of regional security . As a result , several trilateral summit meetings regarding this issue have occurred within the framework of the Security and Prosperity Partnership of North America ( SPP ) , a region-level dialogue with the stated purpose of providing greater cooperation on security and economic issues , founded in Waco , Texas on March 23 , 2005 by Paul Martin , former Prime Minister of Canada , Vicente Fox , then-President of Mexico , and George W. Bush , former President of the United States
September 11 attacks
September 11 attacks
Foreign relations of Mexico