Question: In numerical order what US president built the brown house?

Context paragraphs:
List of routes in Frederick County, Virginia: This is a complete list of routes in Frederick County, Virginia, United States.  Green: VA Secondary Routes.  Turquoise: VA Primary State Routes.  Gold: US Routes.  White: Interstate Routes.  Routes are listed in numerical order.

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.  A Republican, as Secretary of Commerce in the 1920s he introduced Progressive Era themes of efficiency in the business community and provided government support for standardization, efficiency and international trade.  As president from 1929 to 1933, his ambitious programs were overwhelmed by the Great Depression, which seemed to get worse every year despite the increasingly large-scale interventions he made in the economy.  He was defeated in a landslide in 1932 by Democrat Franklin D. Roosevelt, and spent the rest of his life as a conservative denouncing big government, liberalism and federal intervention in economic affairs, as Democrats repeatedly used his Depression record to attack conservatism and justify more regulation of the economy.

Mathematics (song): "Mathematics" is a b-side single from Mos Def's solo debut album, "Black on Both Sides".  It contains lyrics about various social issues and asks the listener to add them up and come to conclusions about them.  Many references to numbers are found in this song and at times, Mos Def rhymes statistics in numerical order.  The song highlights the differences between the White and African-American citizens of the US and uses the lyrics "Do your math..." (from Erykah Badu's "On & On") telling young African-American's to 'do their maths' so they can avoid being part of the numerous degrading statistics he raps about in the opening and third verses of the song.  The song is produced by DJ Premier whose famous scratch samples make up the song's bridge.  Premier has called it one of his favorite beats.

Collation: Collation is the assembly of written information into a standard order.  Many systems of collation are based on numerical order or alphabetical order, or extensions and combinations thereof.  Collation is a fundamental element of most office filing systems, library catalogs, and reference books.

Sorting algorithm: In computer science, a sorting algorithm is an algorithm that puts elements of a list in a certain order.  The most-used orders are numerical order and lexicographical order.  Efficient sorting is important for optimizing the use of other algorithms (such as search and merge algorithms) which require input data to be in sorted lists; it is also often useful for canonicalizing data and for producing human-readable output.  More formally, the output must satisfy two conditions:

List of routes in Jefferson County, West Virginia: This is a complete list of routes in Jefferson County, West Virginia, United States.  Green: WV Secondary (County) Routes.  Turquoise: WV State Routes.  Gold: US Routes.  Blue: Residential Routes.  Routes are listed in numerical order.

Sam Brown House: Sam Brown House (or Samuel Brown House) is a historic house in Gervais, Oregon, United States built in 1857 by Oregon pioneer and state senator Samuel Brown (1821-1886).  The house is located on the French Prairie on the Peter Depot land claim and is believed to be the first in Oregon to be designed by an architect.

Thomas Brown House (Franklin, Tennessee): Old Town, also known as the Thomas Brown House, is a house in Franklin, Tennessee, United States, at the Old Town Archeological Site that was built by Thomas Brown starting in 1846.  It is a two-story frame structure built on an "I-House" plan, an example of vernacular architecture showing Greek Revival influences.  The Thomas Brown House is among the best two-story vernacular I-house examples in the county (along with the William King House, the Alpheus Truett House, the Claiborne Kinnard House, the Beverly Toon House, and the Stokely Davis House).

Rapidan Camp: Rapidan Camp (also known at times as Camp Hoover) in Shenandoah National Park in Madison County, Virginia, was built by U.S. President Herbert Hoover and his wife Lou Henry Hoover, and served as their rustic retreat throughout Hoover's administration from 1929 to 1933.  The first family's residential cabin was known as the "Brown House" in contrast to their more famous residence, the White House.

Lawrence Brown House: The Lawrence Brown House, better known as the L.B. Brown House is the home of Lawrence Bernard Brown a self-made businessman, community leader, and master carpenter.  The importance of the L.B. Brown House is that it may be the only home built by a former enslaved person, left in Florida.  The house "stands as a living testimony to one person's triumph over adversity."

Supporting paragraphs: Rapidan Camp Herbert Hoover
Answer: 31st