During the Last Few Years, the Benefits of NAFTA Have

Short Answer

During the last few years, the benefits of NAFTA have been slowly eroded by
the ups and downs of the Canadian dollar.
the reluctance of U.S. producers to sell goods to Canadian companies.
delays at border crossings between the U.S. and Canada.
higher inflation rates in the U.S. than in Canada.
objections from Mexico about unfair deals between the U.S. and Canada that shut Mexico out of export possibilities.