1. In 1786, the South Carolina General Assembly passed the Pinckney Treaty, also known as the Treaty of San Lorenzo, which established the southern border of the United States and ensured access to the Mississippi River for American commerce.

2. In 1865, the final battle of the American Civil War in South Carolina took place at the Battle of Palmito Ranch, resulting in a Confederate victory, though it ultimately had no impact on the outcome of the war.

3. In 1896, the Supreme Court of South Carolina ruled in favor of African American plaintiff Richard Cain in the case of Cain v. Rhodes, which challenged the constitutionality of segregated seating on railroads in the state.

4. In 1923, the South Carolina state legislature ratified the 19th Amendment to the United States Constitution, granting women the right to vote.

5. In 1978, the ruins of the colonial-era city of Charles Towne Landing were declared a National Historic Landmark, preserving the site of the first permanent English settlement in the Carolinas.