Amodel used by social workers to understand whether an event in the family system becomes crisis, as well as understanding the family's resources and definition of the event is the:

idk but found this on google

"the kansas-nebraska act allowed each territory to decide the issue of slavery on the basis of popular sovereignty. kansas with slavery would violate the missouri compromise, which had kept the union from falling apart for the last thirty-four years. the missouri compromise had prevented this from happening since 1820."

credit card number 4 is the right answer