Answer:
It denounces the practice of slavery and urging northern citizens not to be vengeful against former Confederates.
Creon wants to arrest and execute Antigone because she went against his civil laws. He forbade everyone to bury Antigone's brother's body, because he was a traitor to the state, however, Antigone didn't listen to his orders and believed he deserved a proper burial, and not to be fed to the dogs. This is why she got arrested, and died in the end.