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Missouri, constituent state of the United States of America. To the north lies Iowa; across the Mississippi River to the east, Illinois, Kentucky, and Tennessee; to the south, Arkansas; and to the west, Oklahoma, Kansas, and Nebraska. With the exception of Tennessee, Missouri has more neighboring states than any other U.S. state. Bisecting the state is the Missouri River, flowing from Kansas City in the west, through the state’s capital, Jefferson City, in the center,...