1. South Carolina has only had 18 Leap Days since its founding in 1663. This is because Leap Years occur every four years, except for century years that are not divisible by 400. So, the years 1700, 1800, and 1900 were not Leap Years.

2. On Leap Day in 1692, the colony of South Carolina was officially divided into two counties: Berkeley County and Craven County. These counties were named after British politician John Berkeley and English naval officer William Craven.

3. Leap Day in 1804 saw the establishment of the Charleston and Hamburg Railroad Company, which aimed to connect Charleston with the town of Hamburg on the Savannah River. This was a major infrastructure project that helped boost economic growth in the region.

4. In 1832, Leap Day marked the beginning of the Nullification Crisis in South Carolina. The crisis arose from a dispute over tariffs that were seen as unfairly benefiting Northern manufacturers at the expense of Southern farmers. South Carolina ultimately threatened to secede from the Union, but a compromise was reached to avoid armed conflict.

5. On Leap Day in 1932, South Carolina held its Democratic Presidential Primary. This was an important election because it was held during the height of the Great Depression and featured high-profile candidates such as Franklin Roosevelt and Al Smith. Roosevelt won the primary and went on to win the Presidency later that year.