Under President Donald Trump, the United States has taken a tough stance against migrant workers from Mexico crossing the U.S.-Mexican border. Trump’s efforts to build a longer and better wall, so far unsuccessful, are based on the premise that the U.S. economy is better off with fewer migrant workers, regardless of whether such migrants are documented. But is it true? Two decades after the signing of the North American Free Trade Agreement (NAFTA), the economy of North America is closer than ever to being completely integrated prior to the ongoing renegotiations.