Architecture: 1850s-1890s. 1850s. James Buchanan, at the urging of his niece and White House hostess Harriet Lane, added a wooden greenhouse on the roof of the west terrace in 1857, adjacent to the State Dining Room. One could enter a private world of plants and flowers grown for decorating the house.
A caucus is a meeting of supporters or members of a specific political party or movement. The term originated in the United States, but has spread to Australia, Canada, New Zealand, South Africa, Brazil and Nepal.
That meeting was the germ of the political caucuses which have formed so prominent a feature of our government ever since its organization.. American Heritage Dictionary states the term is taken from the Caucus Club of Boston in the 1760s, possibly derived from Medieval Latin caucus, drinking vessel.