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The American Civil War (1861–1865) was a sectional conflict in the United States of America between the federal government (the "Union") and 11 Southern slave states that declared their secession and formed the Confederate States of America, led by President Jefferson Davis. The Union, led by President Abraham Lincoln and the Republican Party, which opposed expansion of slavery, rejected any right of secession. Fighting began April 12, 1861 when Confederate forces attacked a Federal fort at the Battle of Fort Sumter.

In the first year, the Union asserted control of the border states and established a naval blockade as both sides raised large armies. In 1862 the large, bloody battles began. After the Battle of Antietam in September 1862, Lincoln's Emancipation Proclamation made the freeing of the slaves a war goal, despite opposition from Copperheads who supported slavery and secession. Emancipation ensured that Britain and France would not intervene to help