1. On June 15, 1776, the 1st South Carolina Regiment was formed in the Continental Army during the American Revolutionary War. The regiment went on to fight in several important battles, including the Siege of Charleston and the Battle of Eutaw Springs.

2. In 1839, the Charleston and Hamburg Railroad opened for business on June 15th. This was the first railroad in South Carolina and one of the earliest in the United States. It connected the cities of Charleston and Hamburg, which is now North Augusta.

3. June 15, 1846, marked the beginning of the Mexican-American War, which had a significant impact on South Carolina. The state sent several volunteer regiments to fight in the war, and many prominent South Carolinians, including Wade Hampton III, served in the conflict.

4. On June 15, 1864, Confederate General James Longstreet launched an attack on Union forces at Petersburg, Virginia, during the American Civil War. The battle, which lasted for several days, was part of a larger campaign to capture the key railroad junction of Petersburg and ultimately take Richmond, the Confederate capital.

5. Finally, on June 15, 1928, Strom Thurmond graduated from Clemson Agricultural College (now Clemson University) with a degree in horticulture. Thurmond went on to have a long and influential political career, serving as governor of South Carolina and as one of the longest-serving members of the U.S. Senate.