http://money.cnn.com/2016/03/31/news/economy/mexico-us-globalization-wage-gap/index.html?iid=hp-toplead-dom
One expert, Robert Scott at the Economic Policy Institute, estimates that the U.S. lost roughly 800,000 jobs to Mexico between 1997 and 2013. He cites NAFTA -- the North American Free Trade Agreement signed in 1993 -- as the key driver for job losses.