It was a factor, but not a sole cause. Most Southerners were not slave owners, and had zero interest in fighting for the sake of slave owners.
Yes, the civil war was started on the issue of slavery.
civil war
It was a Northern State that was pro slavery and anti Confederacy. It did not view the civil war as a slave issue. It considered the civil war a states rights issue.
slavery
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The American Civil War *facepalm*
slavery became an issue many years before the civil war.
It is NOT the "civil war". Slavery was a very minor issue at the start of the war.
I'm not exactly sure what you're asking. If you're asking if the civil war started the issue of slavery, no. Slavery was always an issue. If you're asking if slavery started the civil war, not exactly. The point of the civil war according to Abraham Lincoln was to preserve the Union. The Confederacy was only fighting in defense. Eventually slavery became abolished as an aftermath of the civil war, but the only reason the war itself was started was in order to preserve the Union.
Slavery
The issue of slavery.