How and why did the south seced and form the confederacy?

The force of events moved very quickly upon the election of Lincoln. South Carolina acted first, calling for a convention to secede from the Union. State by state, conventions were held, and the Confederacy was formed. Within three months of Lincoln's election, seven states had seceded from the Union.

Iwould say a, due to the fact these routes display many things that would be useful and provide explanations for how states are known.