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John Dramani Mahama, Ghana's president, speaks during the U.S.-Africa Business Forum in New York, U.S., on Wednesday, Sept. 21, 2016. The forum focuses on trade and investment opportunities on the continent for African heads of government and American business leaders. Photographer: Michael Nagle/Bloomberg via Getty Images

John Dramani Mahama, Ghana's president, speaks during the U.S.-Africa Business Forum in New York, U.S., on Wednesday, Sept. 21, 2016. The forum focuses on trade and investment opportunities on the continent for African heads of government and American business leaders. Photographer: Michael Nagle/Bloomberg via Getty Images