well, in september 1901, president mckinley is in buffalo, new york, at the pan-american exposition. he's shaking hands with the public, when an anarchist named leon czolgosz assassinates him. suddenly, vice president teddy roosevelt is sworn in. among his many big ambitions is a gut rehab of the executive mansion. >> 1902 was a major reshaping of the symbol of the white house into a more worldly time. america became more international, and the white house was redone to be compatible with that. >> t.r.'s goal is to return it to its original federalist incarnation, while clearing it out to accommodate a brood of six children and a pony. it also means separating the living quarters from our nation's most important executive offices. >> he moved the offices out of the family floor and built the west wing. he reorganized the place so it wasn't just an old plantation house. >> to that end, roosevelt's architects rearrange the entrance, removing this stairway and these victorian tiffany panels from the cross hall -- as well as all that old ornamental woodwork, like the plinths. the workers