Look up 'breach of contract'.
The US constitution has within it, means to resolve issues between the states, or between the states and the federal Constitution.
Then why didn't disHonest Abe pursue those? Delegates were sent to Warshington for that express purpose, weren't they. disHonest Abe didn't want a court resolution because his overriding objective was to destroy once and for all the system of federalism and states' rights that the founding fathers had created as a check on the centralizing tendencies of the state. He didn't put it this way, of course, but instead used the deceptive language of "saving the Union." But holding any union together at gunpoint destroys it by destroying its voluntary and consensual nature.
But, we can't expect a hard core neo-yank False Cause Loser to accept the truth in place of your cherished propaganda, can we, herr meaker?
Lincoln didn’t pursue a legal case after the south started shooting. The Confederates never had much of a legal system, Jeff Davis never got around to appointing anyone to the pretended Confederate Supreme Court.
The southern insurrectionists didn’t pursue a legal case until after they lost the war. Then their legal case, (Texas v. White) was lost too.