Some of my fellow bloggers are wont to refer to the Southern Confederacy in the U.S. Civil War as the Treason in Defense of Slavery movement, for example renaming "Confederate Heritage Month" as "Treason in Defense of Slavery Heritage Month." This admirable avoidance of euphemism led me to wonder how to characterize the movement described in today's New York Times story about a 1939 plan on the the part of some Wyoming residents to have parts of Wyoming, Montana, and South Dakota (unconstitutionally!) secede from their states to form a new one, as depicted below.

It's not treason against the United States, since they seem to have been planning to remain a State (though it's not clear from the story how concrete their plans were), and, again relying just on the story, they didn't seem to have any particular grievance with their state governments which seceding was supposed to resolve, so it wasn't in defense of anything. I'll go with Insurrection in Relief of Boredom.