One more time....
I own me.
You own you.
This is my stuff.
That's your stuff.
If you and I decide to swap stuff, the existence of an arbitrary political border between us should matter no more than the existence of a highway or a telephone line between us.
Anyone requiring you to give your stuff to me is probably on my payroll in some way.
As long as your actions don't cause harm to me and mine, what you do is none of my business.
A few exceptions: We need a structure in place to enforce contracts, provide some very basic infrastructure, referee in disputes about externalities (see comments), and maybe defend the borders. If we limited government to that, and only that, our borders will need a lot less defending.
I don't care if you go on a crystal meth binge with gay midget hookers in a gas-guzzling SUV outfitted with semi-automatic weapons and the complete works of Barry Manilow on 8-track. As long as it doesn't hurt me and mine, we're fine. (I already know what its like to shoot skeet with Manilow's "Weekend In New England" in the background. Long, tiresome story.)
One more time....
I own me.
You own you.
Do what you said you were going to do.
That's all.
Thanks.