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.
The first difference between a caucus and a primary is who organizes them. A caucus is organized by the political parties in that state; a primary is run by the state government like any other election. A caucus is a much more complicated procedure and involves people meeting in a variety of locations such as community centers, schools and churches.