The Militia Act of 1792, as amended in 1795 precludes unilateral state secession.
The Judiciary Act of 1789 requires that "controversies of a civil nature" between the states be submitted to the Supreme Court.
As you can see, the Federalists acted quickly to solidify the power of the national government.
Walt
Forced union is contrary to the principles of Christian self-government and voluntary union. The idea of union began with the Puritans in 1643. Union is based on the principle of brotherly love, and when it is forced from above, it becomes tyranny. That's my opinion. But then, a central govt. naturally seeks more power for itself, as we have seen the behemoth grow to epic proportions of late, to a point where federalism is virtually dead.