This article provides an analysis of the famous NAFTA trade deal by detailing its successes and failures within both an historical and geographical context. As intended and, perhaps, as one would expect, NAFTA has been very successful in helping integrate the economies of the U.S. and Mexico as evident in the fact that "trade between the US and Mexico has risen from 1.3% of combined GDP in 1994 to 2.5% in 2015". Furthermore, the article notes how "Mexico’s real income per person, on a purchasing-power-parity basis, has risen from about $10,000 in 1994 to $19,000." Despite this, however, critics of the deal rightly point out that individual economic gains have been very unevenly distributed and, relatively speaking, could be much greater.
When evaluating the merits of a trade deal like NAFTA, it's necessary to do so within a larger historical and economic framework. Specifically, this article discuses how the "full potential" of NAFTA was never reached due to events like the Mexican peso crises from 1994-95, American border controls enacted in the wake of 9/11, and even the growth of China's economy. Importantly, while it's certainly true that NAFTA has led to some job loss, economic historian Brad DeLong points to an estimate that this may only account for around .1% of net job losses in the U.S. economy, "fewer jobs than the American economy adds in a typical month." Beyond this, a more complete assessment shows that manufacturing jobs have been on the decline for several decades, an outcome that has only been accelerated with the rise of automation technologies not to mention a strong dollar and higher quality transportation/communication capacities that have made relocating abroad increasingly attractive.
Although NAFTA could very well have never been signed, America's incredibly close physical proximity to Mexico along with the respective size of each countries' economies makes it essentially inevitable they'd be trading partners. Additionally, while concerns about the changing nature of jobs in an increasingly globalized world are legitimate, it's important to remember that, as this article points out, globalization is not a zero-sum game since a greater exchange of goods and services ultimately stands to benefit everyone. Moreover, because of NAFTA Mexico has become more prosperous overall thereby better enabling it to deal with migration (net migration to the U.S. has, in fact, been negative for several years now), an issue which, ironically, some who oppose NAFTA are fervently worried about. What do you think of NAFTA's impact over the last 23 years?
http://www.economist.com/news/finance-and-economics/21716033-nafta-has-been-disappointment-its-benefits-are-underappreciated-defence