Some Confederate apologists quote part of a speech Lincoln made when he was questioning the right of the US to engage in a war with Mexico.
Here is the section usually quoted:
"Any people anywhere, being inclined and having the power, have the right to rise up, and shake off the existing government, and form a new one that suits them better. This is a most valuable,—most sacred right—a right, which we hope and believe, is to liberate the world."
http://teachingamericanhistory.org/library/index.asp?document=949But they forget to mention that Lincoln opposed the war with Mexico in large part because he thought it was an effort to expand American slavery.
"Fellow Whig Abraham Lincoln contested the causes for the war and demanded to know exactly where Thornton had been attacked and American blood shed. "Show me the spot," he demanded. Whig leader Robert Toombs of Georgia declared:
This war is nondescript .... We charge the President with usurping the war-making power ... with seizing a country ... which had been for centuries, and was then in the possession of the Mexicans .... Let us put a check upon this lust of dominion. We had territory enough, Heaven knew."
Northern abolitionists attacked the war as an attempt by slave-owners—frequently referred to as "the Slave Power"—to strengthen the grip of slavery and thus ensure their continued influence in the federal government. Acting on his convictions, Henry David Thoreau was jailed for his refusal to pay taxes to support the war, and penned his famous essay, Civil Disobedience."
http://teachingamericanhistory.org/library/index.asp?document=949http://wiki.answers.com/Q/Who_opposed_the_Mexican_warMost Americans will agree that armed revolt may be justified in order to free a people, if peaceful means are not effective. Most Americans do not support a rebellion that would allow a despot to gain power. The question is, will the rebellion increase or decrease liberty? (E.G. Most Americans hope that the "Arab Spring" will result in peaceful, secular democracies, but fear it may result in fanatical Muslim governance.) But the Confederacy was not aimed at freeing a people, it was aimed at perpetuating the slavery of a people. A secession for such a cause is not legal, and certainly not ethical, in the eyes of most Americans.