Carlos Slim Helu (left) talks with Steve Forbes of Forbes magazine. The magazine lists the Mexican telecom mogul as the world's richest man, with a net worth of $73 billion. Jeremy Piper/AP hide caption

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Jeremy Piper/AP

How NAFTA Helped The Mexican Billionaires' Club

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If The NAFTA Vote Were Held Today, How Would It Fare?

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Obama's Position On Free Trade Marks Subtle Evolution

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The Secret Protectionism Buried Inside NAFTA

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Wave Of Illegal Immigrants Gains Speed After NAFTA

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The Bombardier Challenger 300 is one of the most popular midsize business jets in production. Canada-based Bombardier has boomed in the two decades since the North American Free Trade Agreement was signed. Todd Williamson/AP hide caption

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Todd Williamson/AP

NAFTA Opened Continent For Some Canadian Companies

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An auto worker tightens bolts on a Focus at a Ford plant in Michigan in October. Labor unions predicted in 1993 that NAFTA would send many U.S. manufacturing jobs to Mexico, and they continue to argue that the pact prompted a race to the bottom for workers. Mira Oberman/AFP/Getty Images hide caption

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Mira Oberman/AFP/Getty Images

What Has NAFTA Meant For Workers? That Debate's Still Raging

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Freshly caught catfish wriggle in large nets in Doddsville, Miss. Jackie Northam/NPR hide caption

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Jackie Northam/NPR

Battle Of The Bottom Feeder: U.S., Vietnam In Catfish Fight

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How NAFTA Drove The Auto Industry South

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Unrealized, Unforeseen Environmental Results Of NAFTA

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NAFTA Turns 20, To Mixed Reviews

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A truck bearing Mexican and U.S. flags approaches the border crossing into the U.S., in Laredo, Texas. Reuters /Landov hide caption

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Reuters /Landov

Kayakers head out on the Rio Grande toward one of the international bridges that connect Laredo, Texas, and the town of Nuevo Laredo in Mexico. Raw sewage and animal carcasses float in the water. Neena Satija/Texas Tribune hide caption

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Neena Satija/Texas Tribune

Despite Efforts, The Rio Grande Is One Dirty Border

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