Missouri known as the show me state is one of the 50 states in the United States. Its capital is Jefferson City. Its largest cities are Kansas City and Saint Louis. Some other cities are Columbia, where the University of Missouri is, and Springfield. Missouri officially became a state on August 10, 1821. Missouri's borders touch eight states. On the north, it touches Iowa; to the east, across the Mississippi River, it touches Illinois, Kentucky, and Tennessee; to the south, it touches Arkansas; and on the west, it touches Oklahoma, Kansas, and Nebraska (Kansas and Nebraska are across the Missouri River).