WASHINGTON, DC - SEPTEMBER 14: A pair of slave shackles are on display in the Slavery and Freedom Gallery in the Smithsonian's National Museum of African American History and Culture during the press preview on the National Mall September 14, 2016 in Washington, DC. Filled with exhibits and artifacts telling the story of the first Africans in the United States and their descendents, the 400,000-square-foot museum will open to the public on September 24. (Photo by Chip Somodevilla/Getty Images)
