That is up for debate. However, most experts agree that the main cause of the civil war was state's rights.
it wasn't about slavery
It was the primary cause of the American Civil War.
it wasn't about slavery
No, many southerners believed that they had a right to break away from the union.
Yes.
Slavery.
The most important cause of the American Civil War was slave-holding. While numerous regional issues separated northern and southern states in the Union, it was slavery that divided the nation at the deepest level, and it was slavery that finally led to the costly War between the States in 1861-1865.
Slavery
Civil Rights lobbyists always try to put slavery at the centre of the picture. But it was really the potential loss of the cotton revenues that worred the North, along with the fragmenting of the young American democracy.
slavery and enconomic diffrences
If the question is "Is the slavery a cause for the colonies declaring independence from Britain," then no. They wanted freedom from them. Slavery was a big issue in the Civil War, though.
The most significant cause in the Civil War was unfair taxation, states' rights and slavery.