Activists hold a rally to protest the Trans-Pacific Partnership trade agreement in front of the White House on Feb. 3. Trade has become a key issue in the U.S. presidential campaign. Olivier Douliery/Getty Images hide caption

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A food market in Singapore in 2012. The U.S. government says that American farmers can help "fill the void" being created by rising demand for meat in countries like Singapore through the Trans-Pacific Partnership. Allie Caulfield/Flickr hide caption

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President Obama and Japanese Prime Minister Shinzo Abe approach the podiums for a joint press conference Tuesday at the Rose Garden of the White House in Washington. President Obama is hoping to finalize a new trade agreement with Japan and other Asian nations soon. Alex Wong/Getty Images hide caption

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Obama Confident In Asia Trade Pact, But Track Record For Deals Is Spotty

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President Obama talks with Malaysian Prime Minister Najib Razak at the East Asia Summit in Myanmar in November. Obama is trying to strike a 12-country Trans-Pacific Partnership, which would include Malaysia. Christophe Archambault/AFP/Getty Images hide caption

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In 2013, the U.S. imported about 2 million tons of Coronas and Modelos, making beer Mexico's largest agricultural export to the U.S., according to a USDA report. Scott Olson/Getty Images hide caption

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A lot of produce Americans buy comes from Mexico, and it's the result of the North American Free Trade Agreement — NAFTA — which took effect 20 years ago this month. Amy Sussman/AP hide caption

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The Fruits Of Free Trade: How NAFTA Revamped The American Diet

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Mark Lennihan/AP

Why Mexico Is The World's Biggest Exporter Of Flat-Screen TVs

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