Virginia was the most important among them. Why did Virginia secede?
Stop letting the minority of 4 states speak for the majority of 11.
And for what it's worth, Columnist Paul Craig Roberts explains *WHY* they specifically mentioned "slavery" as their reasons for secession even though Lincoln and the Republicans voted for the Corwin amendment which would protect slavery indefinitely by US Constitutional amendment.
Most of the Confederate states explicitly cite slavery as their cause for succeeding, but to take that at face value is like concluding that WWII was only about Poland.