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WASHINGTON, DC - SEPTEMBER 14: Guests sample dishes like Son-of-a-Gun stew, pan-roasted oysters, smoked haddock, corn croquettes with a gribiche sauce, slow cooked collards and other traditional foods at the Smithsonian's National Museum of African American History and Culture's Sweet Home Cafe 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)

WASHINGTON, DC - SEPTEMBER 14: Guests sample dishes like Son-of-a-Gun stew, pan-roasted oysters, smoked haddock, corn croquettes with a gribiche sauce, slow cooked collards and other traditional foods at the Smithsonian's National Museum of African American History and Culture's Sweet Home Cafe 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)
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WASHINGTON, DC - SEPTEMBER 14: Guests sample dishes like Son-of-a-Gun stew, pan-roasted oysters, smoked haddock, corn croquettes with a gribiche sauce, slow cooked collards and other traditional foods at the Smithsonian's National Museum of African American History and Culture's Sweet Home Cafe 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)

WASHINGTON, DC - SEPTEMBER 14: Guests sample dishes like Son-of-a-Gun stew, pan-roasted oysters, smoked haddock, corn croquettes with a gribiche sauce, slow cooked collards and other traditional foods at the Smithsonian's National Museum of African American History and Culture's Sweet Home Cafe 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)
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WASHINGTON, DC - SEPTEMBER 14: Rock 'n' Roll legend Chuck Berry's candy-apple red 1973 Cadillac Eldorado is on display in the Musical Crossroads section of the fourth floor Culture Galleries at 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)

WASHINGTON, DC - SEPTEMBER 14: Rock 'n' Roll legend Chuck Berry's candy-apple red 1973 Cadillac Eldorado is on display in the Musical Crossroads section of the fourth floor Culture Galleries at 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)
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Getty Images News Chip Somodevilla

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WASHINGTON, DC - SEPTEMBER 14: Guests can sit underneath images of men and women conducting lunch counter sit-ins to protest segregation in the Sweet Home Cafe at the Smithsonian's National Museum of African American History and Culture 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)

WASHINGTON, DC - SEPTEMBER 14: Guests can sit underneath images of men and women conducting lunch counter sit-ins to protest segregation in the Sweet Home Cafe at the Smithsonian's National Museum of African American History and Culture 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)
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Getty Images News Chip Somodevilla

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WASHINGTON, DC - SEPTEMBER 14: A technician measures the light shining on a document 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)

WASHINGTON, DC - SEPTEMBER 14: A technician measures the light shining on a document 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)
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Getty Images News Chip Somodevilla