In the presidential election of 1860 the Republican Party nominated Abraham Lincoln as its candidate. Party spirit soared as leaders declared that slavery could spread no farther. The party also promised a tariff for the protection of industry and pledged the enactment of a law granting free homesteads to settlers who would help in the opening of the West. The Democrats were not united. Southerners split from the party and nominated Vice President John C. Breckenridge of Kentucky for president. Stephen A. Douglas was the nominee of northern Democrats. Diehard Whigs from the border states, formed into the Constitutional Union Party, nominated John C. Bell of Tennessee.  

Lincoln and Douglas competed in the North, and Breckenridge and Bell in the South. Lincoln won only 39 percent of the popular vote, but had a clear majority of 180 electoral votes, carrying all 18 free states. Bell won Tennessee, Kentucky and Virginia; Breckenridge took the other slave states except for Missouri, which was won by Douglas. Despite his poor electoral showing, Douglas trailed only Lincoln in the popular vote.  

Lincoln's election made South Carolina's secession from the Union a foregone conclusion. The state had long been waiting for an event that would unite the South against the antislavery forces. Once the election returns were certain, a special South Carolina convention declared "that the Union now subsisting between South Carolina and other states under the name of the "United States of America' is hereby dissolved." By February 1, 1861, six more Southern states had seceded. On February 7, the seven states adopted a provisional constitution for the Confederate States of America. The remaining southern states as yet remained in the Union.  

Less than a month later, on March 4, 1861, Abraham Lincoln was sworn in as president of the United States. In his inaugural address, he refused to recognize the secession, considering it "legally void." His speech closed with a plea for restoration of the bonds of union. But the South turned deaf ears, and on April 12, guns opened fire on the federal troops stationed at Fort Sumter in the Charleston, South Carolina, harbor. A war had begun in which more Americans would die than in any other conflict before or since.  

In the seven states that had seceded, the people responded promptly to the appeal of the new president of the Confederate States of America, Jefferson Davis. Both sides now tensely awaited the action of the slave states that thus far had remained loyal. In response to the shelling of Fort Sumter, Virginia seceded on April 17, and Arkansas, Tennessee and North Carolina followed quickly. No state left the Union with greater reluctance than Virginia. Her statesmen had a leading part in the winning of the Revolution and the framing of the Constitution, and she had provided the nation with five presidents. With Virginia went Colonel Robert E. Lee, who declined the command of the Union Army out of loyalty to his state. Between the enlarged Confederacy and the free-soil North lay the border states, of Delaware, Maryland, Kentucky and Missouri which, despite some sympathies with the South, remained loyal to the Union.  

Each side entered the war with high hopes for an early victory. In material resources the North enjoyed a decided advantage. Twenty-three states with a population of 22 million were arrayed against 11 states inhabited by 9 million. The industrial superiority of the North exceeded even its preponderance in population, providing it with abundant facilities for manufacturing arms and ammunition, clothing and other supplies. Similarly, the network of railways in the North enhanced federal military prospects.  

The South had certain advantages as well. The most important was geography; the South was fighting a defensive war on its own territory. The South also had a stronger military tradition, and hence the region initially boasted the more experienced military leaders.