In numerical order what US president built the brown house?
Rapidan Camp:  The first family's residential cabin was known as the "Brown House" in contrast to their more famous residence, the White House. Herbert Hoover: Herbert Clark Hoover (August 10, 1874October 20, 1964) was an American engineer, businessman, and politician who served as the 31st President of the United States from 1929 to 1933 during the Great Depression.
31st