HumanWave, sorry if I made my point poorly, or in a way that seemed to be mischaracterizing your position. Here is what I meant: you point that there is a precedent, and you do so in a way that suggests you think it is relevant. There are a couple things you could mean:
a) That the precedent is in some sense binding, or established a principle that will always apply. This is false. I guess we both agree on that.
b) It is not binding. It is just something that happened once in a particular set of circumstances. It might happen again, or it might not. This is true, but it doesn't really support any point, especially. What choices people make, and the political realities that surround them (as in, how people would react to their doing them) change with people and times. Citing what happened in 1818 and observing that it is a precedent (as, surely, it is, like everything that has happened in history) doesn't establish a single thing.
So either way, I fail to see how it establishes anything relevant. If you mean that the executive has *usually not* reacted well, and there are reasons to think they won't again, well, that is another thing. And perhaps you're right, but I don't think it's clear they'd use force.
As for Washington and Oregon: "One is a positive law that conflicts with a federal classification. The other is an outright denial of federal authority."
A distinction without a difference, imo. Both of them are saying, "We're going to do things this way despite what you say, and we dare you to come stop us." There's an argument to be made that the WA/CO one is worse, because it's a law that's actually going to have immediate effect if the federal government doesn't act promptly, so it puts the feds on the spot immediately to stand them down or not. The Alabama thing is some vague declaration with unclear import.