The difficulty with secession is that, on one hand, the decentralization aspect is great, but on the other hand, many people will want to stay united with other people in the country. As libertarians, we'll have to respect that too. However, most of those people will also want to not let people secede.
Difficult stuff.
I like the map btw!
Yes, very difficult. But, I believe that if secession is granted to everyone, we could have situations like Kaliningrad & Russia. Same country, but not the same land. In Croatia, a small town in Bosnia & Herzegovina actually splits the country apart. If people can tolerate a little bit of mess, we could have a lot of freedom!