The American Civil War (1861–1865), also known as the War Between the States (among other names), was a civil war in the United States of America. Eleven Southern slave states declared their secession from the United States and formed the Confederate States of America, also known as "the Confederacy". Led by Jefferson Davis, the Confederacy fought for its independence from the United States. The U.S. federal government was supported by twenty mostly Northern free states in which slavery already had been abolished, and by five slave states that became known as the border states. These twenty-five states, referred to as the Union, had a much larger base of population and industry than the South. After four years of bloody, devastating warfare (mostly within the Southern states), the Confederacy surrendered and slavery was outlawed everywhere in the nation. The restoration of the Union, and the Reconstruction Era that followed, dealt with issues that remained unresolved for generations".
Abraham Lincoln discussing strategy