This issue was posed to opposing teams of British and American lawyers, asking whether America acted legally to use the Declaration of Independence to separate from the British Empire. According to BBC Magazine, the judges found in favor of the Americans, because of the American argument that the reasoning behind the Declaration of Independence already appeared in a British document in 1688: "The English had used their own Declaration of Rights to depose James II and these acts were deemed completely lawful and justified."
I still have to wonder why, if secession was so amply justified in 1776; that the same act, under similar circumstances, has been deemed illegal and reprehensible both in 1861 and today. To me, it seems logically inconsistent.
Secession will take place in the near future, because nothing really unites the country that has taken diversity to an extreme. There are no unifying principles, religion, or language. As Patrick Buchanan wrote recently (article in the Tampa Tribune, but published nationally), we will face a "secession of the heart." We need to think about this now, while it is still possible to do so in an orderly manner.