1. South Carolina declared independence from Great Britain on March 20, 1776 - On March 20, 1776, South Carolina's Provincial Congress passed a resolution declaring the colony's independence from Great Britain. This resolution made South Carolina the first colony to declare independence from British rule.

2. Charleston was founded on March 20, 1670 - On March 20, 1670, a group of English colonists led by William Sayle landed at Albemarle Point on the west bank of the Ashley River in present-day Charleston County. They established the first permanent English settlement in South Carolina, which eventually became the city of Charleston.

3. The Confederate Ironclad CSS Chicora was launched on March 20, 1862 - During the American Civil War, the Confederate States Navy launched the CSS Chicora in Charleston Harbor on March 20, 1862. The Chicora was an ironclad warship that played a significant role in the defense of the harbor against Union forces.

4. Clemson University was founded on March 20, 1889 - On March 20, 1889, the South Carolina General Assembly passed an act establishing the Clemson Agricultural College of South Carolina. This college later became Clemson University and is now one of the state's largest and most prestigious institutions of higher learning.

5. The Greenville and Columbia Railroad was completed on March 20, 1854 - The Greenville and Columbia Railroad was completed on March 20, 1854, connecting the cities of Greenville and Columbia for the first time by rail. This railroad played a significant role in the economic development and growth of the Upstate region of South Carolina.