Question: In what year was the president whose younger brother was a member of the United States House of Representatives for Tennessee's 6th congressional district from 1851 to 1853 born?

full_context: Document 1: William H. Holland (politician): William H. Holland (1841 - May 27, 1907) was an educator who served one term in the Texas Legislature. He was born into slavery in Marshall, Texas in 1841, the child of Captain Bird Holland and a slave named Matilda. At some time during the 1850s, his father purchased his freedom along with his two brothers and sent them to attend an abolitionist-run school in Ohio. During the American Civil War, he served in the Union Army, while his father died while serving as a Confederate Army officer. After the war ended, he returned to Texas where he taught school and became active in the Republican Party. He was elected to the legislature in 1876. William was the brother of Medal of Honor recipient, Milton M. Holland.
Document 2: Polk Place: Polk Place was the home of 11th President of the United States James K. Polk and his wife Sarah Childress Polk on Vine Street in Nashville, Tennessee, which he purchased from his mentor Felix Grundy. It was called "Grundy Place" and was changed to "Polk Place." It was his final residence and where he died in 1849 at age 53. After his death his wife continued to reside there. During the Civil War, Polk Place was considered neutral ground by both the Confederate and Union armies. In spite of the fact that she had nephews fighting on the Confederate side, Union Generals Ulysses S. Grant and Don Carlos Buell frequently paid their respects to the former first lady. After a short illness, Mrs. Polk died at Polk Place in 1891, just short of her 88th birthday. James K. Polk's tomb was located on the front lawn until 1893, when it was moved to the Tennessee State Capitol. What followed was a long legal dispute centered on James K. Polk's will, after which the heirs of President and Mrs. Polk sold Polk Place. The state of Tennessee nearly acquired Polk Place and made it the governor's mansion (at the time, the governor of Tennessee stayed in a hotel room). A developer bought the house and had it demolished in 1900 to build a small apartment building. The YWCA bought the property in 1909 and built a new state-of-the-art facility. They sold the building in 1978 and moved to Woodmont Avenue. The Capitol Hotel (formerly Best Western) now occupies the former site of Polk Place.
Document 3: William Hawkins Polk: William Hawkins Polk (May 24, 1815 – December 16, 1862) was an American politician and a member of the United States House of Representatives for Tennessee's 6th congressional district from 1851 to 1853. He was the younger brother of President James K. Polk. Prior to his election to Congress, he had been a member of the Tennessee House of Representatives (1841–1845), served as U.S. Minister to the Kingdom of the Two Sicilies (1845–1847), and fought as a major in the Mexican-American War.
Document 4: William Hall (governor): William Hall (February 11, 1775October 7, 1856) was an American politician who served as the seventh Governor of the state of Tennessee from April to October 1829. Hall ascended to the office when Governor Sam Houston resigned amidst a scandal, and, as Speaker of the Tennessee Senate, he was the first in the line of succession. After finishing Houston's term, he did not seek reelection. Hall had previously served in the Tennessee state legislature, both in the House and Senate. Following his brief term as governor, he served one term in the United States House of Representatives.
Document 5: James Buchanan: James Buchanan Jr. ( ; April 23, 1791June 1, 1868) was the 15th President of the United States (1857–61), serving immediately prior to the American Civil War. He is the only president from Pennsylvania, the only president to remain a lifelong bachelor, and the last president born in the 18th century. A member of the Democratic Party, he was the 17th United States Secretary of State and served in the United States Senate and United States House of Representatives.
Document 6: Tim Walz: Timothy James Walz (born April 6, 1964) is an American politician and member of the Minnesota Democratic–Farmer–Labor Party who has served as the U.S. Representative for 2=nd
Document 7: James K. Polk: James Knox Polk (November 2, 1795 – June 15, 1849) was the 11th President of the United States (1845–49). He previously served as the 13th Speaker of the House of Representatives and as Governor of Tennessee. A protege of Andrew Jackson, Polk was a member of the Democratic Party and an adherent of Jacksonian democracy and Manifest Destiny. During his presidency, the United States expanded significantly with the annexation of Republic of Texas, the Oregon Treaty, and the conclusion of the Mexican-American War.
Document 8: John Quincy Adams: John Quincy Adams ( ; July 11, 1767 – February 23, 1848) was an American statesman who served as a diplomat, United States Senator, member of the House of Representatives, and the sixth President of the United States from 1825 to 1829. He was a member of the Federalist, Democratic-Republican, National Republican, and later the Anti-Masonic and Whig parties. He was the son of President John Adams and Abigail Adams and thus contributed to the formation of the Adams political family.
Document 9: Robert J. Walker: Robert John Walker (July 19, 1801November 11, 1869) was an American lawyer, economist and politician. An active member of the Democratic Party, he served as a member of the U.S. Senate from Mississippi from 1835 until 1845, as Secretary of the Treasury from 1845 to 1849 during the administration of President James K. Polk, and briefly as Territorial Governor of Kansas in 1857.
Document 10: William H. Harrison (Wyoming politician): William Henry Harrison (August 10, 1896October 8, 1990) was an American politician who served as a Republican U.S. Representative from Wyoming. He was a grandson of the 23rd President of the United States, Benjamin Harrison, and a great-great grandson of the 9th President of The United States, William Henry Harrison.
Document 11: James K. Polk Ancestral Home: The James K. Polk Ancestral Home, also known as James K. Polk Home State Historic Site, is a historic house museum at 301 West 7th Street in Columbia, Tennessee. Built in 1816, it is the only surviving private residence of United States President James K. Polk. It was designated a National Historic Landmark in 1961, and is listed on the National Register of Historic Places. It is open daily except select holidays for guided tours.
Document 12: Andrew Jackson: Andrew Jackson (March 15, 1767 – June 8, 1845) was an American soldier and statesman who served as the seventh President of the United States from 1829 to 1837. Before being elected to the presidency, Jackson gained fame as a general in the United States Army and served in both houses of Congress. As president, Jackson sought to advance the rights of the "common man" against a "corrupt aristocracy" and to preserve the Union.
Document 13: Lewis Cass: Lewis Cass (October 9, 1782June 17, 1866) was an American military officer, politician, and statesman. He represented Michigan in the United States Senate and served in the Cabinet of Andrew Jackson and James Buchanan. He was also the 1848 Democratic presidential nominee and a leading spokesman for the Doctrine of Popular Sovereignty, which held that the people in each territory should decide whether to permit slavery.
Document 14: Jefferson Davis: Jefferson Davis (born Jefferson Finis Davis; June 3, 1808 – December 6, 1889) was an American politician who served as the President of the Confederate States from 1861 to 1865. He was a member of the Democratic Party who represented Mississippi in the United States Senate and the House of Representatives prior to becoming president of the Confederacy. He was the 23rd United States Secretary of War, serving under U.S. President Franklin Pierce from 1853 to 1857.
Document 15: William S. Barry: William S. Barry (born William Taylor Sullivan Barry; December 10, 1821 – January 29, 1868) was an American politician who served as member of the Provisional Congress of the Confederate States from Mississippi. Prior to this Barry served as a member of the U.S. House of Representatives from Mississippi's 2nd congressional district.
ground_truth: 1795