Now, in the case of the rock thrown into Virginia from Maryland, your actions did harm in a different state, so you're not really doing eveything in the borders of your own state- the damage arose in Virginia.I can see that to a certain extent, but mostly because a rock is a pretty, uh, concrete example. But some states might consider actionable things that other states wouldn't think to. For example, laws against (so-called) excessive noise, or (so-called) pollutants, or whatever. I could be doing something in my state that's perfectly legal here, but someone over the border could object and claim that I caused harm to him. And in that instance, it seems I'd be subject to the laws of his state.
Hmmm - interesting question. Massachusetts resident lives in and owns property which abuts Rhode Island tract. Massachusetts side is residentially zoned per local ordinance, but moving into the adjoining Rhode Island tract is a 24/7 scrap metal yard and body shop, and Rhode Island doesn't prohibit such a use. And there is no question that the Masshole is now beeing kept up by loud noises and subjected to foul odors and visual blight.
Get out your blue books.....