SLL is all for secession, soft or otherwise. From Jeff Deist at mises.org:
In 1930, Columbia professor Karl Llewellyn published The Bramble Bush, his famous tract on how to think about and study law. Llewellyn urged readers to consider both law and custom when seeking to understand a society, to recognize the difference between black letter legal codes and the day to day practices of state officials and citizens. Where there was no sanction, the author instructed, there was no law. In other words, we should focus on the substance of things at least as much as we focus on the form. This is an important lesson for how we view the United States today, with an eye toward what is actually happening on the ground among people and institutions, rather than legal formalisms.
A few years ago, on a panel discussion at an event in Vienna, Dr. Hans-Hermann Hoppe made an offhand remark I found very interesting. Paraphrasing him, he said that nationalist movements in the nineteenth and twentieth centuries were largely centralizing while the nationalist movements of the twenty-first century were largely decentralist in character—breakaway movements represented by Brexit, Taiwan, Scotland, Catalonia, and others. Donald Trump also represented a breakaway movement of sorts, away from DC, but of course this possibility went totally unfulfilled.
This strikes me as an important insight. What we know as today’s map of Europe is really countries cobbled together from principalities, city-states, kingdoms, dukedoms. And the EU seeks, but has not achieved, total dominion over them as a supranational government. What we think of as the US is really an incredibly disparate set of regions which became fifty states over which the US federal government asserts almost total control. And in both cases, cities became politically, economically, and culturally dominant.