Why did the southern state leave the union

Considering all the people of the time understood the issue of slavery. in 150 to 200, explain the following law and how the people in the society might have changed or regulated their behavior based on reading this law. what would you do? clearly state why you would make that choice. 16.if anyone receives into his house a runaway male or female slave of the court, or of a freedman, and does not bring it out at the public proclamation of the major domus, the master of the house shall be put to death