Just who is supposed to vote on this referendum? All Northeast citizens, or just citizens of a particular state? Who opens the vote? When is it held? Or is this just supposed to be symbolic with no actual vote?
Citizens of the state it's being held in. From a game perspective, it's symbolic, but it'd hypothetically have a binding effect. (Just look at 2022 Olympics to see how they can have an effect.)
You haven't specified in the law who opens the vote, how long it is open for, when it is held, etc. It's also not clear to me that we can call for a state-only referendum by law instead of in the Northeast constitution, but that's a separate issue.
It seems like this law is only a symbolic one, not one where we will actually vote on these referenda, so is that sort of thing really necessary to add?