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A portrait of a young James Buchanan, the 15th President of the United States, 1870. From the New York Public Library. (Photo by Smith Collection/Gado/Getty Images).

A portrait of a young James Buchanan, the 15th President of the United States, 1870. From the New York Public Library. (Photo by Smith Collection/Gado/Getty Images).

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James Buchanan (1791-1868), 15th US President (B&W)

James Buchanan (1791-1868), 15th  US President (B&W)

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Portrait of James Buchanan (1791 - 1868), who served as the fifteenth president of the United States, mid nineteenth century. (Photo by PhotoQuest/Getty Images)

Portrait of James Buchanan (1791 - 1868), who served as the fifteenth president of the United States, mid nineteenth century. (Photo by PhotoQuest/Getty Images)

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Politics, Personalities, USA, pic: circa 1840, James Buchanan, portrait, James Buchanan (1791-1868) the 15th President of the United States 1857-1861, who was the only President who never married (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

Politics, Personalities, USA, pic: circa 1840, James Buchanan, portrait, James Buchanan (1791-1868) the 15th President of the United States 1857-1861, who was the only President who never married  (Photo by Bob Thomas/Popperfoto via Getty Images/Getty Images)

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circa 1860: American president James Buchanan's cabinet. (Photo by Library Of Congress/Getty Images)

circa 1860:  American president James Buchanan's cabinet.  (Photo by Library Of Congress/Getty Images)