The US Civil War began in April 1861 when Confederate forces opened fire on Fort Sumter in South Carolina. This marked the start of the war between the Union states of the North and the Confederate states of the South. The war was fought over the issues of states' rights and slavery and resulted in major battles in Virginia and the Mississippi Valley. Key events and battles included the Union blockade of Southern ports, the capture of New Orleans in 1862, the surrender of Vicksburg in 1863, and the Battle of Gettysburg in 1863 where Lincoln later gave his famous Gettysburg Address dedicating the battlefield cemetery. The war ended in April 1865 with the surrender of Confederate forces.