It's an interesting question when you follow it logically all the way back to its root.
Indeed it is.
In reading your last post, I can see a number of places where our chains of reason diverge. I also see a number of points in your post that raise further questions.
For example, did France have the right to lay claim to the territory designated in the Louisiana Purchase in the first place? If so, how was that claim laid and was the method legitimate?
And do we accept the assertion that the Indians had a right to the property they claimed to "own"? For example, a group of people saying they own Manhattan is clearly not the same as that same group proving their (legitimate) right to ownership. Did they lay claim in a legitimate fashion? Or did they point to miles of land and say, "mine." Or worse, did they simply kill or drive out other tribes that inhabited the area? Surely, hunting on miles of land does not, in itself, give one a right of ownership to those miles of territory. If we agree on this point, it is questionable how much of the land they "sold" was "owned" by them.
And there remains the second of my two initial sets of questions: how does a state establish its sovereignty? By force? By edict? Do you feel the method with which a state does so is legitimate?
If we define "sovereignty" simply as authority over territory, and can agree that authority springs from ownership or agency (i.e. an agent hired by the owner of territory to exert authority), then figuring out ownership becomes doubly important. To my knowledge, the
validity of sovereignty does not rely on an ability to defend the territory over which authority is claimed. To be sure, a stronger person may assert ownership/sovereignty by might, but so too might John Gotti's gang.
Incidentally, I'm not asking for responses to any of the questions above. I think we've gone as far as we can go with this for now. It's Friday and the evening is right around the corner - it's time to enjoy friends and family.
Thanks for taking the time to clarify your position. By the way, if you're ever bored, check out Spooner's letter to Grover Cleveland (specifically Section VI)...
Lysander Spooner: Letter to Grover Cleveland
I can imagine Cleveland reading it, thinking "What on earth is this crank talking about?!" lol