Because many American Conservatives believe that NAFTA has leeched our labour force and fed "American Jobs" to the Mexican economy. Many NAFTA skeptics cite the loss of U.S. manufacturing jobs as a reason to criticize NAFTA and to be wary of future trade deals. According to the CFR, the U.S. auto sector lost roughly 350,000 jobs between 1994 and 2016. Many of those jobs were taken up by workers in Mexico, where the auto sector added over 400,000 jobs in the same period.
Besides that (the main and largest reason), the only other reasons are that NAFTA hurt the economic prospects of Mexican small farmers and small business owners, and that NAFTA suppressed wages for non-college-educated workers in the U.S.
1940s. In the United States, where Ten Thousand Villages (formerly Self Help Crafts) began buying needlework from Puerto Rico in 1946, and SERRV began to trade with poor communities in the South in the late 1940s. The first formal “Fair Trade” shop which sold these and other items opened in 1958 in the USA.
