In you opinion, perhaps.
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But the government can compel states to abide by the Constitution.
Agreed.
Please show me the Constitutional prohibition against secession.
Thank you.
The Constitution makes it clear that states can only be created with the consent of the other states through a vote in Congress. Once admitted states cannot combine with other states without consent of Congress or split into two or more states without consent of Congress. The cannot change their border by a fraction of an inch without consent of Congress. Implicit in that is the need for Congressional consent to leave altogether. Or so the Supreme Court found in the Texas v. White decision.