A few months from now, California (with popular support inside the state) unilaterally secedes from the United States of America, in the process declaring the ascendency of a second Trump presidency to be unacceptable. California also actively urges other states to do the same.
In such a scenario, what would happen next?
Would there be a civil war or would California be allowed to peacefully leave? Could California function as an independent country? How does this change the geopolitical landscape?