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New historical exhibit in Philadelphia

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AP

Members of the Buffalo Soldiers Resurrected: George Darrah, left, James Pittman, and Dr. Daddese Ekulona visit the President's House: Freedom and Slavery in Making a New Nation exhibit in the historic district of Philadelphia, Wednesday, Dec. 15, 2010. Behind the visitors are etched the names of slaves who resided at the house. The new permanent installation was unveiled Wednesday on the footprint of the home and executive mansion of Presidents George Washington and John Adams when Philadelphia was the nation's capital from 1790 to 1800.

AP

People visit the President's House: Freedom and Slavery in Making a New Nation exhibit in the historic district of Philadelphia, Wednesday, Dec. 15, 2010. The new permanent installation was unveiled Wednesday on the footprint of the home and executive mansion of Presidents George Washington and John Adams when Philadelphia was the nation's capital from 1790 to 1800. (AP Photo)

AP

People view the exposed foundation at the President's House: Freedom and Slavery in Making a New Nation exhibit in the historic district of Philadelphia, Wednesday, Dec. 15, 2010. The new permanent installation was unveiled Wednesday on the footprint of the home and executive mansion of Presidents George Washington and John Adams when Philadelphia was the nation's capital from 1790 to 1800.