I just came across this little piece of information from Wikipedia.
On May 2, 2000, South Carolina governor Jim Hodges signed a bill to make Martin Luther King Jr.'s birthday an official state holiday. South Carolina is the last state to recognize the day as a paid holiday for all state employees. Prior to this, employees could choose between celebrating Martin Luther King Day or one of three confederate holidays.
I was unaware there were three confederate holidays. I check it out. There are many.