Some surprising commentary on secession:
'Any people whatsoever have the right to abolish the existing government, and form a new one that suits them better. This is a most valuable, a most sacred right.'
- Abraham Lincoln, 4 July 1848
But that isn't the opinion he is remembered for of course:
'Abraham Lincoln, in order to maintain the unity of the United States...resorted to the use of force...so, I think Abraham Lincoln, president, is a model, is an example.'
- Chinese Premier Zhu Rongii referring to the secession of Taiwan, 8 April 1999
'urely that can with no propriety of language be called a Union when the only means by which the weaker is held connected with the stronger portion is force. It may, indeed, keep them connected; but the connection will partake much more of the character of subjugation on the part of the weaker to the stronger than the union of free, independent, and sovereign States in one confederation, as they stood in the early stages of the government, and which only is worthy of the sacred name of Union. ...The South asks for justice, simple justice, and less she ought not to take. She has no compromise to offer but the Constitution, and no concession or surrender to make. She has already surrendered so much that she has little left to surrender.'
- Sen. John C. Calhoun, 4 March 1850