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NEW YORK, NY - FEBRUARY 01: Shackles for slave children are seen on display at the New-York Historical Society on February 1, 2012 in New York City. A rare handwritten copy of the Thirteenth Amendment which abolished slavery after it was unveiled at the society today. The document, signed by Abraham Lincoln, was unveiled to coincide with Black History Month and will be on display until April 1. (Photo by Mario Tama/Getty Images)
NEW YORK, NY - FEBRUARY 01: Shackles for slave children are seen on display at the New-York Historical Society on February 1, 2012 in New York City. A rare handwritten copy of the Thirteenth Amendment which abolished slavery after it was unveiled at the society today. The document, signed by Abraham Lincoln, was unveiled to coincide with Black History Month and will be on display until April 1. (Photo by Mario Tama/Getty Images)

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