The 1860 presidential election saw the Democratic party split along sectional lines, nominating two separate candidates. The Republican party nominated Abraham Lincoln, while a new Constitutional Union party nominated John Bell. Lincoln won the election, causing many southerners to believe the South had lost its voice in government. After several failed compromise attempts in Congress, seven southern states seceded from the Union to form the Confederate States of America. This divided the nation and led to the outbreak of the Civil War when Confederate forces fired on Fort Sumter in South Carolina in April 1861.