The only problem with that inscription is that it's a lie. There was no rebellion* in 1860, since no Confederate State attempted to overthrown the government in Washington, D. C..
Thanks for bringing this subject up, Rodeo. Dr. Thomas DiLorenzo's new book
Lincoln Unmasked has now shipped and is in the hands of Americans. I'm almost one half through it, and must say it's better than his first book on Lincoln and the War on Southern Freedom,
The Real Lincoln: A New Look at Abraham Lincoln, His Agenda, and an Unnecessary War.
In Lincoln Unmasked, DiLorenzo documents more about Lincoln's connection with Northeastern corporations and the push for corporate welfare that was the specialty of the Whigs, and by direct inheritance, the Republican Party, giving us what we have today in the White House.
Great reads, both of them.
Oh, and one more thing, since you brought this up, please state where in the Constitution it's forbidden for a state to withdraw from the compact of states.
*In point of fact, the rebellion in occured in 1861 when Lincoln rebelled against Constitutional government and ordered the US Army to invade the Confederacy.