1. The Missouri Compromise was signed on March 6, 1820, but the debates and discussions leading up to its signing were occurring on March 5th. The compromise allowed for Missouri to be admitted as a slave state and Maine as a free state to maintain the balance of power between free and slave states in the United States.

2. On March 5, 1868, Missouri ratified the 14th Amendment to the United States Constitution, which granted citizenship and equal protection under the law to all people born or naturalized in the United States.

3. The St. Louis Cardinals played their first exhibition game of the 1965 season on March 5th against the New York Mets in St. Petersburg, Florida. The Cardinals won 2-1 thanks to a home run from Lou Brock.

4. On March 5, 1978, the Missouri State Penitentiary experienced one of the largest prison riots in United States history. The riot lasted for 33 hours and resulted in the deaths of four inmates and the injury of several others.

5. The Missouri Tigers men's basketball team won their first Big 12 Tournament on March 5, 1999, by defeating the Iowa State Cyclones 70-58. The Tigers went on to make it to the Elite Eight in the NCAA Tournament later that year.