The North American Free Trade Agreement—or NAFTA, as we Americans call it—is very much in the news of late, primarily because President Trump has decided to make good on what he famously called “the single worst trade deal” that the United States has ever approved. Trump’s assessment, like so many of his statements, isn’t quite the fact he’d like it to be. In study after study, economists have found that NAFTA’s impact on the U.S. economy ranges from relatively insignificant to mildly . . .