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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Mexico's President Enrique Pena Nieto gestures after delivering a speech at the Los Pinos presidential Palace in Mexico City on Tuesday. Yuri Cortez /AFP/Getty Images hide caption

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In this video frame grab image taken from Milenio TV via APTN, police look at the scene where a gas tank truck exploded outside a maternity and children's hospital in Mexico City on Thursday. AP hide caption

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Jasjit Kaur Singh, an Indian chef, cooks kaala channa, a traditional spicy Sikh dish. A psychologist says that children who grow up in cultures with lots of spicy food are taught to like spice early on. Richard Lautens/Toronto Star via Getty Images hide caption

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La Roca restaurant in Nogales, Mexico, draws a mix of American tourists and locals. It used to have an American bank account and credit card until the bank closed the account. Jude Joffe-Block/KJZZ hide caption

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Pablo Cote holds a photo of his deceased father of the same name in July 2013 in Tlaxcala, Mexico. Cote was kidnapped while driving back from the U.S. border to the east-central state of Tlaxcala. He was beaten to death, part of the mass killing of 193 bus passengers and other travelers by the Zetas. Ivan Pierre Aguirre/AP hide caption

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Relatives of 43 students who went missing in Iguala, Mexico, search for them on a hill on the outskirts of town on Nov. 29. After the students vanished, searches around Iguala have turned up nearly a dozen clandestine graves. None of the remains found in those mounds belonged to the students. Eduardo Verdugo/AP hide caption

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Maria Isabel de la Paz, a U.S. citizen, was twice turned away when trying to enter the U.S. legally. When she attempted an illegal crossing, her case was decided by a Border Patrol agent, not an immigration judge. John Burnett/NPR hide caption

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Natividad de la Cruz Bartolo shows a picture of her son, Emiliano, one of 43 university students who went missing months ago. Carrie Kahn/NPR hide caption

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A woman walks toward the international crossing gate in Nogales, Ariz., in March 2013. Jahi Chikwendiu/Washington Post via Getty Images hide caption

itoggle caption Jahi Chikwendiu/Washington Post via Getty Images