paragraph_text: The Merchants Bridge, officially the Merchants Memorial Mississippi Rail Bridge, is a rail bridge crossing the Mississippi River between St. Louis, Missouri, and Venice, Illinois. The bridge is owned by the Terminal Railroad Association of St. Louis. It opened in May 1889 and crossed the river north of the Eads Bridge.

paragraph_text: 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.

paragraph_text: The Burlington–Bristol Bridge is a truss bridge with a lift span crossing the Delaware River from Burlington, New Jersey to Bristol Township, Pennsylvania in the United States. Construction of the bridge started on April 1, 1930, and the bridge opened to traffic on May 2, 1931. The bridge carries NJ 413 and PA 413.

paragraph_text: Chenango Bridge is a hamlet in the southern part of the Town of Chenango in Broome County, New York, United States. It lies where State Route 12A (Chenango Bridge Road) crosses the Chenango River. The population was 2,883 at the 2010 census, which lists the community as a census-designated place.

paragraph_text: In World War II, it was recognised that the Rhine would present a formidable natural obstacle to the invasion of Germany, by the Western Allies. The Rhine bridge at Arnhem, immortalized in the book, A Bridge Too Far and the film, was a central focus of the battle for Arnhem, during the failed Operation Market Garden of September 1944. The bridges at Nijmegen, over the Waal distributary of the Rhine, were also an objective of Operation Market Garden. In a separate operation, the Ludendorff Bridge, crossing the Rhine at Remagen, became famous, when U.S. forces were able to capture it intact – much to their own surprise – after the Germans failed to demolish it. This also became the subject of a film, The Bridge at Remagen. Seven Days to the River Rhine was a Warsaw Pact war plan for an invasion of Western Europe during the Cold War.

paragraph_text: The Juscelino Kubitschek bridge, also known as the 'President JK Bridge' or the 'JK Bridge', crosses Lake Paranoá in Brasília. It is named after Juscelino Kubitschek de Oliveira, former president of Brazil. It was designed by architect Alexandre Chan and structural engineer Mário Vila Verde. Chan won the Gustav Lindenthal Medal for this project at the 2003 International Bridge Conference in Pittsburgh due to "...outstanding achievement demonstrating harmony with the environment, aesthetic merit and successful community participation".

paragraph_text: Alden Park Manor is a living community located at 5500 Wissahickon Avenue in the Germantown neighborhood of Philadelphia, Pennsylvania in the United States.

paragraph_text: Alden Township is a township in Saint Louis County, Minnesota, United States. The population was 213 at the 2010 census.

paragraph_text: The Fengdu Yangtze River Bridge is a suspension bridge which crosses the Yangtze River in Fengdu County, Chongqing, China. Completed in 1996, it has a main span of placing it among the longest suspension bridges in the world.

paragraph_text: Pont de Vieille-Brioude (Vieille-Brioude Bridge) is located in France, crossing the Allier River. It is a masonry arch bridge with a span of that was built in 1832.

paragraph_text: The Dartford - Thurrock River Crossing, commonly known as the Dartford Crossing and until 1991 the Dartford Tunnel, is a major road crossing of the River Thames in England, carrying the A282 road between Dartford in Kent to the south with Thurrock in Essex to the north. It consists of two bored tunnels and the cable - stayed Queen Elizabeth II Bridge. The only fixed road crossing of the Thames east of Greater London, it is the busiest estuarial crossing in the United Kingdom, with an average daily use of over 130,000 vehicles. It opened in stages: the west tunnel in 1963, the east tunnel in 1980 and the bridge in 1991. The crossing, although not officially designated a motorway, is considered part of the M25 motorway's route, using the tunnels northbound and bridge southbound. Described as one of the most important road crossings in Britain, it suffers from heavy traffic and congestion.

paragraph_text: The Eudora Kaw River Bridge is an automobile and pedestrian crossing of the Kansas River located just north of Eudora, Kansas. A girder bridge, it is the first bridge over the river for almost four miles, as the Highway 2 Bridge is far off to the east.

paragraph_text: La Crosse Rail Bridge is a swing bridge that spans the Mississippi River between La Crescent, Minnesota and La Crosse, Wisconsin.

paragraph_text: The Hohenzollern Bridge () is a bridge crossing the river Rhine in the German city of Cologne (German: "Köln"). It crosses the Rhine at kilometre 688.5. Originally, the bridge was both a railway and road bridge. However, after its destruction in 1945 and its subsequent reconstruction, it was only accessible to rail and pedestrian traffic.

paragraph_text: The Alden Bridge is a historic bridge in Alden, Iowa, which carries the town's Main Street over the Iowa River. The concrete bridge is long and consists of two spans. It was built in 1936 to replace an earlier wooden bridge that had begun to deteriorate. The Weldon Brothers Construction Co. supervised the bridge's construction, while the Iowa State Highway Commission designed the structure; it was one of the first bridges designed by the ISHC, which used similar plans for many other bridges in the state. Labor for the construction effort came from the Works Progress Administration, providing jobs for many of Hardin County's unemployed residents. The bridge was dedicated on July 4, 1936, as part of Alden's Independence Day celebrations.

paragraph_text: The Mapo Bridge crosses the Han River in South Korea and connects the Mapo District and the Yeongdeungpo District in the city of Seoul. The bridge was completed in 1970. Until 1984, the bridge was called Seoul Bridge.

paragraph_text: Wende Correctional Facility is a maximum security prison located in Town of Alden in Erie County, New York, east of Buffalo. The prison is named for this region of Alden. The prison was formerly the site of a county jail operated by Erie County, New York, and sold to the state to further its need for a maximum security state prison. The Erie County Correctional Facility was built adjacent to Wende.

paragraph_text: The Arlington Memorial Bridge is a Neoclassical masonry, steel, and stone arch bridge with a central bascule (or drawbridge) that crosses the Potomac River at Washington, D.C., the capital of the United States. First proposed in 1886, the bridge went unbuilt for decades thanks to political quarrels over whether the bridge should be a memorial, and to whom or what. Traffic problems associated with the dedication of the Tomb of the Unknown Soldier in November 1921 and the desire to build a bridge in time for the bicentennial of the birth of George Washington led to its construction in 1932.

paragraph_text: The Kentucky & Indiana Bridge is one of the first multi modal bridges to cross the Ohio River. It is for both railway and common roadway purposes together. By federal, state, and local law railway and streetcar, wagon-way, and pedestrian modes of travel were intended by the City of New Albany, City of Louisville, State of Kentucky, State of Indiana, the United States Congress, and the bridge owners. The K & I Bridge connects Louisville, Kentucky to New Albany, Indiana. Constructed from 1881 to 1885 by the Kentucky and Indiana Bridge Company, the original K&I Bridge opened in 1886. It included a single standard gauge track and two wagon ways, allowing wagons and other animal powered vehicles to cross the Ohio River by a method other than ferry for the first time. At the time motorized vehicles were virtually nonexistent. The K&I Bridge company also owned a ferry boat operation during both the 1st and 2nd bridge; eventually that operation was sold as the bridge's success largely outmoded boat usage.

paragraph_text: The North Grand Island Bridge is a pair of twin two-lane truss arch bridges spanning the Niagara River between Grand Island and Niagara Falls in New York, United States. Each bridge carries one direction of Interstate 190 (I-190). Both crossings are operated by the New York State Thruway Authority as part of the Niagara Thruway. The northbound span opened in 1935; the southbound span was finished in 1965.

Question: Who was president when the region where Alden Bridge is found became a state?
Answer: President James K. Polk