If the US Constitution had had a roach motel clause saying once states entered the union they cant get out then it would never have been ratified. The converse is also true.
Exactly. It's hard to juxtapose such a claim with the fact of the Declaration of Independence.
What's really funny is that the Anti-Federalists were arguing that the Constitution would allow the Federal government to use the forces of some states to attack and subdue the independence of others.
Thirdly, the absolute command of Congress over the militia may be destructive of public liberty; for under the guidance of an arbitrary government, they may be made the unwilling instruments of tyranny. The militia of Pennsylvania may be marched to New England or Virginia to quell an insurrection occasioned by the most galling oppression, and aided by the standing army, they will no doubt be successful in subduing their liberty and independency. But in so doing, although the magnanimity of their minds will be extinguished, yet the meaner passions of resentment and revenge will be increased, and these in turn will be the ready and obedient instruments of despotism to enslave the others; and that with an irritated vengeance. Thus may the militia be made the instruments of crushing the last efforts of expiring liberty, of riveting the chains of despotism on their fellow-citizens, and on one another. This power can be exercised not only without violating the Constitution, but in strict conformity with it; it is calculated for this express purpose, and will doubtless be executed accordingly.
http://www.thefederalistpapers.org/antifederalist-paper-29
Turns out the Anti-Federalists were pretty prescient regarding many of the points they put forth in opposition to the Constitution.