The American Civil War , often referred to as The Civil War in the United States, was a civil war fought over the secession of the Confederate States. In response to the election of Abraham Lincoln as President, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25 states supported the federal government . After four years of warfare, mostly within the Southern states, the Confederacy surrendered and slavery was outlawed everywhere in the nation. Issues that led to war were partially resolved in the Reconstruction...
April 12, 1861 - April 9, 1865
|Location:||Southern United States, United States of America, Western United States, Northeast United States, Atlantic Ocean|