In all this there is no mention of purging or expelling a state. How doe the nation rid itsself of a state that is no longer fit for the union?
The 'nation' cannot expel a State. Conversely, a State CAN expel---secede--- from the nation.
The States created these united States. They can un-create it if they wish. The federal government is the servant of the States, not the other way around.