Even back in my minarchist days, I always thought decentralization was the most promising path to liberty. Today, I stumbled upon the text of a proposal I had for a Right Of Secession (ROSE) Amendment to the US Constitution, which would explicitly recognize the right of self-determination of the constituent states:
Considering it the most expedient way to create legal recognition for the inherent right of free individuals to remove territories they own from the political authority to which they were formerly bound (by choice or force), we hereby express our support for the addition of the following amendment to the Constitution of the United States of America:
WHEREAS the issue was formerly settled by force of arms over reasoned discourse, and
WHEREAS, since the War Between The States, it is generally accepted that this Constitution prohibits secession,
THEREFORE we, the citizens of the States, hereby make explicit the unilateral right of secession by any constituent state or territory under this Constitution, in a manner to be specified by the laws of said state or territory.