Missouri became the 24th state of the United States on August 10, 1821. Located in the Midwest, it is bordered by eight states and is known as the "Gateway to the West" due to its historic role in westward expansion. The Missouri River and Mississippi River are major geographic features. Its largest city is Kansas City, and its capital is Jefferson City. Missouri played a complex role during the Civil War as a border state with divided loyalties. Today, it is known for its diverse culture, agriculture, manufacturing, and historical landmarks like the Gateway Arch in St. Louis.