1. On March 20, 1766, the British Parliament repealed the Stamp Act, which had caused widespread protests and resistance in the American colonies. This action helped ease tensions between the colonies and the British government, at least temporarily.

2. Mississippi was admitted as the 20th state in the United States on December 10, 1817. However, it was not until March 20, 1890, that the state legislature officially adopted the current design for the state flag.

3. On March 20, 1965, civil rights activist James Meredith embarked on his March Against Fear, a solo walk from Memphis, Tennessee to Jackson, Mississippi to protest racism and voter suppression in the state. Meredith's march sparked intense opposition and violence, but also inspired others to join him on his journey.

4. On March 20, 1972, the Mississippi Supreme Court ruled that the state's system of electing officials at-large (rather than by district) was unconstitutional, as it had the effect of diluting the voting power of African American citizens.

5. In 1998, on March 20, the United States Supreme Court ruled in the case of Edmondson v. Leesville Concrete Company that it was unconstitutional for lawyers to use peremptory challenges to remove potential jurors based solely on their race. This landmark decision helped strengthen protections against racial discrimination in the judicial system.