WASHINGTON, DC - SEPTEMBER 01: A construction crew works on top of the entrance cover of the soon-to-be-opened Smithsonian National Museum of African American History and Culture September 1, 2016 in Washington, DC. The museum was established by Act of Congress in 2003. It is the only national museum devoted exclusively to the documentation of African American life, history, and culture. A dedication ceremony will be held to mark the grand opening of the museum on September 24. (Photo by Alex Wong/Getty Images)