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Missouri ( miz-OOR-ee) is a landlocked state in the Midwestern region of the United States. Ranking 21st in land area, it borders Iowa to the north, Illinois, Kentucky and Tennessee to the east, Arkansas to the south and Oklahoma, Kansas, and Nebraska to the west. In the south are the Ozarks, a forested highland, providing timber, minerals, and recreation. The Missouri River, after which the state is named, flows through the center and into the Mississippi River, which makes up the eastern border. With over six million residents, it is the 18th-most populous state of the country. The largest urban areas are St. Louis, Kansas City, Springfield, and Columbia; the capital is Jefferson City. Humans have inhabited present-day Missouri for at least 12,000 years. The Mississippian culture, which emerged at least in the ninth century, built cities and mounds before declining in the 14th century. When European explorers arrived in the 17th century, they encountered the Osage and Missouria nations. The French incorporated the territory into Louisiana, founding Ste. Genevieve in 1735 and St. Louis in 1764. After a brief period of Spanish rule, the United States acquired Missouri as part of the Louisiana Purchase in 1803. Americans from the Upland South rushed into the new Missouri Territory. Missouri was admitted as a slave state as part of the Missouri Compromise of 1820. Many from Virginia, Kentucky, and Tennessee settled in the Boonslick area of Mid-Missouri. Soon after, a heavy settlement of Rhinelanders created the Missouri Rhineland, a German cultural region specializing in wine production. Missouri played a central role in the westward expansion of the United States, as memorialized by the Gateway Arch. The Pony Express, Oregon Trail, Santa Fe Trail and California Trail all began in Missouri. As a border state, Missouri's role in the American Civil War was complex, and it was subject to rival governments, raids, and guerilla warfare. After the war, both Greater St. Louis and the Kansas City metropolitan area became centers of industrialization and business. Today the state is divided into 114 counties and the independent city of St. Louis. Missouri's culture blends elements of the Midwestern and Southern United States. It is the birthplace of the musical genres ragtime, Kansas City jazz and St. Louis blues. The well-known Kansas City-style barbecue, and the lesser-known St. Louis-style barbecue, can be found across the state and beyond. Missouri is a major center of beer brewing and has some of the most permissive alcohol laws in the U.S. It is home to Anheuser-Busch, the world's largest beer producer, and produces an eponymous wine produced in the Missouri Rhineland and Ozarks. Outside the state's major cities, popular tourist destinations include the Lake of the Ozarks, Table Rock Lake and Branson. Well-known Missourians include Chuck Berry, Sheryl Crow, Walt Disney, Edwin Hubble, Nelly, Brad Pitt, Harry S. Truman, and Mark Twain. Some of the largest companies based in the state include Cerner, Express Scripts, Monsanto, Emerson Electric, Edward Jones, H&R Block, Wells Fargo Advisors, Centene Corporation, and O'Reilly Auto Parts. Well-known universities in Missouri include the University of Missouri, Saint Louis University, and Washington University in St. Louis. Missouri has been called the "Mother of the West", the "Cave State", and the "Show Me State".