A bus with the Cuban and U.S. flags is seen on a beach in Havana earlier this month. The White House is exploring regulatory changes to provide new opportunities for American citizens and U.S. businesses in Cuba. Yamil Lage/AFP/Getty Images hide caption

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Captives separated by a fence conduct communal evening prayers at the Camp 6 prison building at the U.S. Naval Base at Guantanamo Bay, Cuba. Walter Michot/Miami Herald/TNS/Landov hide caption

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A supporter waves a Cuban flag in front of the country's embassy after it reopened for the first time in 54 years on July 20 in Washington, D.C. The embassy was closed in 1961 when U.S. President Dwight Eisenhower severed diplomatic ties with the island nation after Fidel Castro took power in a communist revolution. Mark Wilson/Getty Images hide caption

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Cubans gather in Santiago de Cuba to celebrate this year's Revolution Day, the 62nd anniversary of Fidel Castro's first open assault on the forces of President Fulgencio Batista, who would eventually be overthrown by the rebels. Yamil Lage/AFP/Getty Images hide caption

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American tourists, like these visitors taking a guided tour in May, still have to provide one of 12 authorized reasons — such as visiting family or engaging in humanitarian work — for travel to Cuba. Desmond Boylan/AP hide caption

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Secretary of State John Kerry spoke with NPR's Steve Inskeep at the State Department. Kerry said if Congress or a future president reverses a nuclear control agreement with Iran, U.S. credibility will suffer. Kainaz Amaria/NPR hide caption

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