Ross Perot warned us that if NAFTA was passed, there would be a "giant sucking sound" of jobs moving to other countries. He may have been a little off on time scale, but he was absolutely right about the overall effect.
I find it somewhat amusing that the NY Times insisted he was wrong. Apparently, they've changed their minds, now that it's too late ...
RP was right about another thing; as their wages go up and our go down, some of those jobs will come back. We're not quite down to his (I assume arbitrary) figure of $6/hour, but we're getting closer. ($6 in 1992 is about $10.50 today.)