Secession wasn’t even illigal: per the 10th paraphrased “whatever (powers) not explicitly granted to the Federal government, shall be reserved to the states, and to the people of those states”.. Secession was not forbad, nor supremecy of the “Federal Government” over the states established: The Confederacy had a legal right to form and exist..
Try quoting accurately. What the 10th Amendment says is: "The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people." The word 'explicitly' does not appear, and you completely forgot the part about powers prohibited to the states. Implied in the Constitution is the need for Congressional approval to leave.
The Confederacy had a legal right to form and exist..
Sorry, but it did not.