What was the first use of the East Sitting Hall at the official residence and workplace of the President of the United States?
East Sitting Hall:  First used as a reception room for guests of the president (the Lincoln Bedroom and the Queens' Bedroom were originally offices of the chief executive), it is now a family parlor with access to the east rooms on the second floor. White House: The White House is the official residence and workplace of the President of the United States.
i don't know