Then the states are forced to ratify the 13th Amendment (which was accepted) as a condition for RE-joining a union they allegedly never left, only when failing to ratify the 14th are kicked out (a violation of Article V BTW), puppet governments are instituted, and the south looted of untold millions in the next 12 years.
And we're supposed to pretend like it never happened. And like it.
The Supreme Court held in the Prize Cases that the "so-called Confederate states" (to use their phrase) were in rebellion and that the president was authorized/required to put down the rebellion.
Walt