"We gather here today at this historic place in Philadelphia not for presidents but rather on behalf of millions of silent voices - the enslaved Africans upon whose backs great wealth was accumulated, both here in the North and in the South," Nutter said. "This place, 'The President's House: Freedom and Slavery in the Making of a New Nation,' is a critical part of the national history, and now it becomes a living story for us to impart to our children . . . and to each other."