This undated handout photo provided by the Smithsonian shows Harriet Tubman's shawl, part of an exhibit "Changing America," beginning Friday at the Smithsonian's National Museum of Afri

 

              This undated handout photo provided by the Smithsonian shows Harriet Tubman
This undated handout photo provided by the Smithsonian shows Harriet Tubman's shawl, part of an exhibit "Changing America," beginning Friday at the Smithsonian's National Museum of African American History and Culture in Washington, presenting a walk back in time through two different eras. A new exhibit, "Changing America," parallels the 1863 emancipation of slaves with the 1963 March on Washington. (AP Photo/Michael Barnes, Smithsonian)