Who declared war in the Civil War?

Fort Sumter, a fort that remained in the union, was running low on supplies. President Lincoln had to decide whether or not to supply fort. If he did he risked war if not he would giving in to the rebels [the confederate]. Lincoln informed South Carolina that he would be resuplying Fort Sumter. Confederate leaders decided to take over Fort Sumter before the supplies ships arrived. On April 12, 1861, the confederates opened fire on Sumter. the attack lasted for 34 hours until the fort had to surrender. The Conferderate attack on Fort Sumter was the beginning of the Civil War.