Slavery was why the north and south were fighting, so it would be slavery
14 Amendment says:
No State shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any State deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws.
The Puritans were members of a religious reform movement known as Puritanism that arose within the Church of England in the late 16th century. They believed the Church of England was too similar to the Roman Catholic Church and should eliminate ceremonies and practices not rooted in the Bible.
Assault a lea of endorse the statement of
the law
They were going to let the people decide for themselves if they where going to allow slavery in their territories.