Question: Who was president when the birthplace of Lars Pearson became a US state?

full_context: Document 1: History of Idaho: When President Benjamin Harrison signed the law admitting Idaho as a U.S. state on July 3, 1890, the population was 88,548. George L. Shoup became the state's first governor, but resigned after only a few weeks in office to take a seat in the United States Senate.
Document 2: History of Texas (1845–1860): The Republic of Texas had formed in 1836, after breaking away from Mexico in the Texas Revolution. The following year, an ambassador from Texas approached the United States about the possibility of becoming an American state. Fearing a war with Mexico, which did not recognize Texas independence, the United States declined the offer. In 1844, James K. Polk was elected the United States president after promising to annex Texas. Before he assumed office, the outgoing president, John Tyler, entered negotiations with Texas. On February 26, 1845, six days before Polk took office, the U.S. Congress approved the annexation. The Texas legislature approved annexation in July 1845 and constructed a state constitution. In October, Texas residents approved the annexation and the new constitution, and Texas was officially inducted into the United States on December 29, 1845.
Document 3: Minnesota: In 1762 the region became part of Spanish Louisiana until 1802. The portion of the state east of the Mississippi River became part of the United States at the end of the American Revolutionary War, when the Second Treaty of Paris was signed. Land west of the Mississippi River was acquired with the Louisiana Purchase, although a portion of the Red River Valley was disputed until the Treaty of 1818. By the late 1700s, the North West Company had established the post of Fort Charlotte at the Lake Superior end of the Grand Portage, until moving 50 miles northeast to Fort William in 1803. In 1805, Zebulon Pike bargained with Native Americans to acquire land at the confluence of the Minnesota and Mississippi rivers. The construction of Fort Snelling followed between 1819 and 1825. Its soldiers built a grist mill and a sawmill at Saint Anthony Falls, the first of the water-powered industries around which the city of Minneapolis later grew. Meanwhile, squatters, government officials, and tourists had settled near the fort. In 1839, the army forced them to move downriver and they settled in the area that became St. Paul. Minnesota Territory was formed on March 3, 1849. The first territorial legislature (held September 2, 1849) was dominated by men from New England or of New England ancestry. Thousands of people had come to build farms and cut timber, and Minnesota became the 32nd U.S. state on May 11, 1858. The founding population was so overwhelmingly of New England origins that the state was dubbed "the New England of the West".
Document 4: Lars Pearson: Lars Pearson (born 1973, in Iowa) is an American writer, editor, and journalist. He is the owner/publisher of Mad Norwegian Press, a publishing company specializing in reference guides to television shows including "Buffy the Vampire Slayer", "Angel" and "Doctor Who", plus the "Faction Paradox" range of novels and comic books. He is also co-author, with Lance Parkin, of "Ahistory: An Unauthorized History of the Doctor Who Universe," which puts every Doctor Who-related story onto a single timeline from the beginning of the universe to its end.
Document 5: Ohio: On February 19, 1803, U.S. President Thomas Jefferson signed an act of Congress that approved Ohio's boundaries and constitution. However, Congress had never passed a resolution formally admitting Ohio as the 17th state. The current custom of Congress declaring an official date of statehood did not begin until 1812, with Louisiana's admission as the 18th state. Although no formal resolution of admission was required, when the oversight was discovered in 1953, Ohio congressman George H. Bender introduced a bill in Congress to admit Ohio to the Union retroactive to March 1, 1803, the date on which the Ohio General Assembly first convened. At a special session at the old state capital in Chillicothe, the Ohio state legislature approved a new petition for statehood that was delivered to Washington, D.C. on horseback. On August 7, 1953 (the year of Ohio's 150th anniversary), President Eisenhower signed a congressional joint resolution that officially declared March 1, 1803, the date of Ohio's admittance into the Union.
Document 6: Montana: Under Territorial Governor Thomas Meagher, Montanans held a constitutional convention in 1866 in a failed bid for statehood. A second constitutional convention was held in Helena in 1884 that produced a constitution ratified 3:1 by Montana citizens in November 1884. For political reasons, Congress did not approve Montana statehood until 1889. Congress approved Montana statehood in February 1889 and President Grover Cleveland signed an omnibus bill granting statehood to Montana, North Dakota, South Dakota and Washington once the appropriate state constitutions were crafted. In July 1889, Montanans convened their third constitutional convention and produced a constitution acceptable by the people and the federal government. On November 8, 1889 President Benjamin Harrison proclaimed Montana the forty-first state in the union. The first state governor was Joseph K. Toole. In the 1880s, Helena (the current state capital) had more millionaires per capita than any other United States city.
Document 7: Des Moines, Iowa: On September 22, 1851, Des Moines was incorporated as a city; the charter was approved by voters on October 18. In 1857, the name ``Fort Des Moines ''was shortened to`` Des Moines'', and it was designated as the second state capital, previously at Iowa City. Growth was slow during the Civil War period, but the city exploded in size and importance after a railroad link was completed in 1866.
Document 8: Iowa: Almost immediately after achieving territorial status, a clamor arose for statehood. On December 28, 1846, Iowa became the 29th state in the Union when President James K. Polk signed Iowa's admission bill into law. Once admitted to the Union, the state's boundary issues resolved, and most of its land purchased from the Indians, Iowa set its direction to development and organized campaigns for settlers and investors, boasting the young frontier state's rich farmlands, fine citizens, free and open society, and good government.
Document 9: Lars Vikør: Lars Vikør is a graduate of the University of Oslo and the University of Leiden. He is a professor of Scandinavian languages and linguistics and specialist in Nynorsk lexicography at the University of Oslo. He is the main editor of the Norwegian Dictionary ("Norsk Ordbok"). He has also engaged in the National Association for Language Collection ("Landslaget for språklig samling").
Document 10: The Devil in the White City: The Devil in the White City Cover of The Devil in the White City Author Erik Larson Country United States Language English Genre History, Historical Fiction Publisher Crown Publishers Publication date 2003 Media type Print (hardcover and paperback) Pages 447 ISBN 0 - 609 - 60844 - 4 OCLC 54397544
Document 11: Indiana: In order to decrease the threat of Indian raids following the Battle of Tippecanoe, Corydon, a town in the far southern part of Indiana, was named the second capital of the Indiana Territory in May 1813. Two years later, a petition for statehood was approved by the territorial general assembly and sent to Congress. An Enabling Act was passed to provide an election of delegates to write a constitution for Indiana. On June 10, 1816, delegates assembled at Corydon to write the constitution, which was completed in 19 days. President James Madison approved Indiana's admission into the union as the nineteenth state on December 11, 1816. In 1825, the state capital was moved from Corydon to Indianapolis.
Document 12: Pearson Education: Pearson Education is a British-owned education publishing and assessment service to schools and corporations, as well for students directly. Pearson owns educational media brands including Addison–Wesley, Peachpit, Prentice Hall, eCollege, Longman, Scott Foresman, and others. Pearson is part of Pearson plc, which formerly owned the "Financial Times". It was created in July 1998 when Pearson plc purchased the education division of Simon & Schuster from Viacom and merged it with its own education division, Addison-Wesley Longman, to form Pearson Education. Pearson Education was rebranded to Pearson in 2011 and split into an International and a North American division.
Document 13: Will Pearson: William E. Pearson (born 1979) is the co-founder of "mental floss", a bi-monthly magazine, which he started with Mangesh Hattikudur ,where both of them were students at Duke University. Pearson graduated from Duke in 2001, with a Bachelor of Arts degree in History. Will Pearson and Mangesh Hattikudur met as freshmen at Duke University and in their senior year parlayed their cafeteria conversations into the first issue of mental_floss magazine. In addition to the magazine, a board game, a weekly CNN Headline News segment and a daily updated website, the two have collaborated on seven mental_floss books. Pearson and Hattikidur were named two of thirty promising 2007 entrepreneurs in business magazine Inc..
Document 14: The Penguin History of the United States of America: The Penguin History of the United States of America is a non-fiction book about the history of the United States written by Hugh Brogan and published by Penguin Books. It was originally titled "The Longman History of the United States of America", published by the Longman company from 1985 through 1999. Longman and Penguin are both part of Pearson PLC. The book starts in the pre-Columbian era and, in the first edition, ends in the mid 1970s. The second edition, or "new edition", added a chapter covering through to the end of the 1980s.
Document 15: Longman: Longman, also known as Pearson Longman, is a publishing company founded in London, England, in 1724 and is owned by Pearson PLC.
ground_truth: President James K. Polk
sub_queries: Lars Pearson >> place of birth Answer: Iowa
who was president when Iowa became a state Answer: President James K. Polk