The document summarizes the key events leading up to the start of the American Civil War. It explains that the Northern and Southern states had economic divisions, with the North industrializing and the South relying on plantation agriculture and slavery. When Abraham Lincoln was elected as president in 1860, Southern states began seceding from the Union out of fears that slavery would be abolished. By February 1861, seven Southern states had seceded and formed the Confederate States of America. On April 12, 1861, Confederate forces fired upon Fort Sumter in South Carolina, marking the start of the Civil War between the Union and Confederacy.