is it unconstitutional to secede from the union
Threats and aspirations to secede from the United States, or arguments justifying secession, have been a feature of the country's politics almost since its birth. Some have argued for secession as a constitutional right and others as from a natural right of revolution. In Texas v. White, the United States Supreme Court ruled unilateral secession unconstitutional, while commenting that revolution or consent of the States could lead to a successful secession.
Secession in the United States