Why did the Confederacy separate from the Union?

Answer 1

They split because they wanted slavery and the union didn't. But not only because of that, but because the union attacked a place in Virgina and the confederacy took that as a sign that a war has started. So, all of the southern states except Maryland split from the union. Maryland fought with the union even though it was a southern state.

Answer 2

To command the Mississippi - an important military highway - and isolate all enemy units to the West of the river.

This freed-up Grant to go to the aid of the Army of the Cumberland in Chatanooga.

Answer 3

Other way round.

It was the USA that declared war on the breakaway Confederacy.

Answer 4

Because the newly-inaugurated Lincoln would not allow any new slave-states, so the South knew it would be increasingly outvoted in Congress, and new laws would tend to favour the North.

Answer 5

the south decided to name themselves the confederate states of America and they separated because of slavery and sectionalism