1. In 1836, Missouri Governor Lilburn Boggs signed into law the "Extermination Order," which called for the extermination or expulsion of all Mormons from the state. This order was a result of tensions between Mormons and non-Mormons in the state and the belief that the Mormons were a threat to the safety and stability of Missouri.

2. April 13, 1861, is the date of the first bloodshed in the American Civil War. Union soldiers in Missouri attempted to resupply the federal armory at Fort Sumter, but the Confederates fired on them, leading to a brief skirmish.

3. The Missouri State Capitol was completed on April 13, 1917. The building was designed by the architect team of Tracy and Swarthout and is located in Jefferson City, the state capital.

4. On April 13, 1928, the Missouri State Highway Patrol was established. The police force was formed to improve highway patrol and safety across the state.

5. Missouri native and famous author, Mark Twain, was born on April 13, 1835. Twain, whose real name was Samuel Clemens, wrote many popular novels, including "The Adventures of Tom Sawyer" and "The Adventures of Huckleberry Finn."