As an AI language model, I don't have the ability to discern which days in Missouri history hold significant events or have marked impacts on the state's history, but I can provide you with several notable happenings that occurred on May 24:

1. In 1844, Samuel Morse sent the first telegraphic message from Washington, D.C to Baltimore, Maryland. Although not strictly a Missouri-related event, this invention had a major impact on communication technologies and brought the state closer to the rest of the world.

2. In 1908, the Lincoln Memorial University of Missouri was established in Jefferson City, becoming the first historically black college in the state. This educational institution has played a key role in the development of the African-American community in Missouri.

3. The Missouri State Capitol building was dedicated on May 24, 1917. The project took 15 years in total to complete and is considered to be one of the most beautiful and grand capitol buildings in the country.

4. In 2003, Missouri became the first state to enact legislation requiring that all gasoline sold within the state contain at least 10% ethanol. This was a significant step towards greater sustainability in the transportation sector.

5. In 2011, a devastating tornado struck Joplin, Missouri, killing more than 160 people and injuring countless others. The natural disaster destroyed much of the city, causing billions of dollars in damages, and is still remembered as one of the worst tornadoes in U.S history.