The Washington Post feels no need to observe normal journalistic standards when it comes to the NAFTA. When the trade agreement was being debated in 1993 it virtually turned the paper (both the news and opinion pages) into an advocacy organization. It continues this pattern even to this day.
As a result, when NAFTA was being debated in the Democratic primaries in 2007, it had a lead editorial in which it harshly criticized the candidates and absurdly claimed that Mexico's GDP had quadruped since 1988. In addition to being hugely wrong (the actual growth was 83 percent according to the IMF), the choice of years was bizarre since NAFTA first took effect in 1994. To this day, the Post has never corrected this editorial.
More recently the Post has repeatedly run articles about Mexico's fast-growing middle class. Some were published earlier this summer and it treats us to another today.
Source: International Monetary Fund.
In reality Mexico had the slowest growing economy in Latin America over the last decade, but what do you expect, it's the Washington Post.