The root cause of the Civil War was economics. The issue of slavery (no wage labor) was just a subset issue, as were tariffs and such. Lincoln had no love for slaves for black people in general and was a racist old codger who'd have sent them all back to Africa if he'd gotten his way, he his driving concern was to preserve the Union not to free black people from bondage.
[roll]
Congratulations!
You are dumber than 2007.