John Brown Fomented an Insurrection. The Whiskey Rebellion would be another and better example. In both cases, the agents weren't states or their agents responding to the democratic will of the people.
If the examples we have had are any indication, it would appear that the natural right to self determination would require the purposeful and knowledgeable consent of the majority of the voting populace in a defined area.
What was the recent defining criteria for Scottish Independence? (Which almost passed by the way. Boy, have the Scots really turned into pathetic welfare recipients nowadays.)
So if I can get 11 of the 20 people on my block to agree, we can declare ourselves to be a different country. Good to know.
What was the recent defining criteria for Scottish Independence?
Since you bring it up, the Scottish referendum of 2014 was agreed to by the British government after negotiations resulting in the Edinburgh Agreement of 2012 and received royal assent from the queen.