1. The Battle of Honey Hill: On December 18, 1864, the Civil War Battle of Honey Hill was fought near the Combahee River in Beaufort County. This battle was part of Sherman's March to the Sea and is considered one of the bloodiest battles fought on South Carolina soil during the Civil War.

2. Birth of Joseph Wanamaker: Joseph Wanamaker, founder of the famous Wanamaker's department store chain, was born in Philadelphia, PA, on December 18, 1838. Wanamaker made significant contributions to his field of merchandising, including pricing and advertising techniques that are still in use today.

3. South Carolina becomes a state: On December 18, 1787, South Carolina became the eighth state to ratify the United States Constitution. The state played a significant role in the drafting of the Constitution, with Charles Pinckney being one of the signers of the document.

4. Birth of Susan Pringle Frost: Susan Pringle Frost was born on December 18, 1873, in Charleston, SC. She was a preservationist and founder of the Preservation Society of Charleston, which played a vital role in the restoration of many historic properties in Charleston.

5. Opening of Clemson University: On December 18, 1889, Clemson University, named after Thomas Clemson, opened its doors to students. Today, the university is known for its exceptional academic programs and devotion to research, and its graduates have gone on to make significant contributions to the state and beyond.