- President Wilson holds first presidential press conference at the Executive Offices of the White House.
- The Rose Garden, which adjoins the Oval Office, is first planted by Woodrow Wilson's first wife, Ellen Wilson, who replaces the colonial garden with a formal rose garden designed with George Burnap.
- Landscape architect Beatrix Farrand designs a new East Garden.
- Sheep keep the White House lawn trim during World War I when the gardeners are conscripted into service.
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 First rose garden
Library of Congress
Sheep on the White House lawn
Library of Congress
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- Electric vacuum cleaners are used in the White House for the first time.
- President Warren G. Harding has a radio set installed in a bookcase in his study on the second floor of the White House.
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- Calvin Coolidge places the first National Christmas Tree in Lafayette Park.
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National Christmas Tree
Library of Congress
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- The White House acquires its first electric refrigerator; iceboxes had been in use since the Polk administration.
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- President Coolidge builds a rooftop solarium to create private space, as a new roof is added and the old attic is turned into a full third floor.
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Rooftop solarium during the Reagan Administration
The White House Collection
White House Historical Association
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- President Herbert Hoover has to vacate the executive office wing for reconstruction as a result of a fire in the attic.
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View of the executive offices after roof burned Christmas Eve 1929
Library of Congress
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