A state in a republic can try to “escape” the Central Govt. if they want, just as a prisoner can try to “escape” from prison. It is implied, the whole purpose of a Federal govt is to contain states rights; -> the whole point of a prison is to contain the inmate. The implied escape attempt of either is a given, whether either the state or a prisoner actually tries or not to escape is up to the state or the prisoner, nothing need be said or codified.
For that analogy to make any sense whatsoever then the states would have to be captured and forced into the Union, and that is not the case. All states were admitted with the consent of the other states, and if there was a case of a state being admitted against its will then I'm not aware of it.
And save us all the excuse that the Southern states were forced into the Union against their will. They were states, freely admitted, before their rebellion. They were states after their rebellion. They were states during their rebellion.