Problem: The Civil War was fought because of slavery and the breakup of the Union. The Southern slave owners would argue that they were ?ghting to keep states' rights, meaning they were dependent on a slave economy, and believed they had the right to keep their livelihood, as they knew it. Northerners and President Lincoln entered the war initially to keep the Union intact. However, war aims would evolve and, with that, northern soldiers would ?ght to emancipate slaves. By 1862, the war turned into a hard war and only the destruction of the enemy's forces and unconditional surrender would end it. Agreeing to the unconditional surrender, though, did not mean reconstructing the Union would be simple.