And as a result of your need to defend the conduct of your ancestor, you cannot speak honestly about what really happened. Your following sentence is an example of this.
The South launched a violent war of secession to preserve an economy based on the use of slave labor.
Lincoln launched a war of conquest to preserve a Union based on legalized slavery. Most of his government was funded by legalized slavery, and he supported an amendment to further strengthen legalized slavery.
So when you accuse the South of supporting slavery, you are deliberately lying about Lincoln and his government's official support for slavery and preserving the slave states as part of the Union.
You distort the truth, because the actual truth is far more ugly for your side. You don't want to talk about legal union slavery, because you can't attack the people who wanted independence from the control of Washington DC/New York power cartel, when your side is just as guilty on the issue of slavery.
The United States had "four score and seven years" of legal slavery, plus another extra six months of legal slavery in the Union after the Confederacy was defeated. The Constitution of the United States explicitly protected the institution of slavery through article IV, section 2, and at the time the constitution was written, the vast majority of all states were slave states.
