FILE - In this Sunday, July 26, 2015 file photo, President Barack Obama, bottom center, shakes hands after delivering a speech laying out his vision for Kenya's future and broad themes of U.S.-Kenya relations, at Safaricom Indoor Arena in Nairobi, Kenya. Africa was electrified by the rise of Barack Obama, the first U.S. president of African descent, who took aim at the twin scourges of corruption and dictatorship and sent thousands of troops to fight one of the most terrifying disease outbreaks in decades. (AP Photo/Evan Vucci, File)
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