Roflol.
Try again .
If they were fighting a war about slavery, they would have started in Maryland, but because they were fighting a war over economic control of a large money producing area of the country, they started the war in Virginia.
The war was about money and only money, but they launched a propaganda campaign to convince the gullible people that it was about slavery, and that's even after they tried to pass the Corwin amendment which would have made slavery permanent.
The propaganda was so good, that people today still believe it.