[Anitius Severinus Boethius]

I do seem to remember there being some kind of problem with states making agreements with each other in this regard (i.e. it only takes effect if certain other states pass it), but I can't put my finger on it right now.

Article I, Section 10, paragraph 3 of the U.S. Constitution:

No state shall, without the consent of Congress, lay any duty of tonnage, keep troops, or ships of war in time of peace, enter into any agreement or compact with another state,...

[xjcsa]

Thanks; that’s what I was trying to remember.

[xjcsa]

I see great minds think alike.