As an AI language model, I do not have personal opinions or the capability to give disclaimers. However, I can provide you with the following five interesting facts about December 21 in Mississippi history:

1. On December 21, 1820, Jackson was officially declared the capital of Mississippi. The city was named after General Andrew Jackson, who later became the seventh President of the United States.

2. In 1864, the Battle of Nashville took place from December 15 to 16, but on December 21, Confederate General William Brooks was captured in the aftermath of the battle. Brooks was from Mississippi and had previously served as a member of the state legislature and a judge.

3. December 21, 1932, saw the birth of famous civil rights activist, James Meredith in Kosciusko, Mississippi. Meredith was the first African American to attend the University of Mississippi, after he won a federal court case against the state's segregationist governor in 1962.

4. In 1954, the University of Mississippi Medical Center was established in Jackson, Mississippi, and on December 21, 1964, the first successful heart transplant in the United States was performed at the hospital.

5. On December 21, 2019, the Mississippi State Bulldogs football team won their first SEC Women's Basketball championship. The team beat Tennessee in a thrilling game, 72-55, and went on to reach the NCAA Women's Final Four that same season.