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"We fought a terrible war to guarantee that one category of mankindblack people in Americacould not be denied the inalienable rights with which their Creator endowed them. The great champion of the sanctity of all human life in that day, Abraham Lincoln, gave us his assessment of the Declarations purpose." - President Ronald Reagan
Like President Lincoln, President Reagan understood what the Civil War was all about and like President Lincoln, President Reagan understood the purpose and true meaning of our Declaration of Independence. They were two of our greatest presidents.

Winston Churchill understood that when Lincoln was murdered, the South lost its best friend:
"Lincoln died the next day, without gaining consciousness, and with him died the only protector of the prostrate South. Others might try to emulate his magnanimity; none but he could control the bitter hatreds which were rife. The assassins bullet had wrought more evil to the United States than all of the Confederate cannonade
[T]he death of Lincoln deprived the union of the guiding hand which alone could have solved the problems of reconstruction and added to the triumph of armies those lasting victories which are gained over the hearts of men."
Those who attempt to float the notion that seceding southerners “just wanted to be left alone” do so out of deceit, not ignorance. The confederacy didn’t wish to simply go their own way - they wished to set themselves up as direct competitors to the United States and dominate the North American continent.
In the same breath as their cowardly shouts of dissolution they began efforts to lay claim to everything that wasn’t bolted or locked down - and much that was. They had designs on all of the western territories and the states of California and Oregon and immediately set about seizing control of them.
At the center of it all was, of course, slavery. The confederates had doubled-down on the Particular Institution and intended to see it expanded everywhere.
It made precious little difference to northern states how they conducted their internal affairs as long as the threat of slavery was allowed to remain.