The U.S. Constitution does not grant the federal government the right to prohibit a state from leaving the union.
And before the Constitution, there was the Declaration of Independence which, despite the disaster at Appomattox, still justifies secession in words too clear to deny.
The Law of Moses, written directly by the Man, authorizes divorce.
Abraham separated peacefully from Lot.
Of course, none of that means anything to the Empire. They would rather kill you than to put a nickel in the jukebox.
Mark.