The American Civil War grew out of a sectional crisis centered on slavery and secession. It began with armed conflict in 1861; the Union first fought to preserve the country, and the war’s aims and consequences expanded to include emancipation. Lee’s surrender at Appomattox in 1865 was a major turning point toward the conflict’s end, but not the last Confederate surrender.
What caused the Civil War?
Slavery was central to the conflict that led to secession and war. Disputes over the balance of power between the federal government and the states had a longer history, but the National Park Service’s Gettysburg National Military Park overview identifies slavery as the main cause of Southern discontent by the 1850s. The political crisis concerned federal authority, the territories, and the future of slavery—not an abstract states’ rights dispute detached from slavery.
Abraham Lincoln’s election in November 1860 was followed by secession. South Carolina left the Union in December, and other states followed before fighting began. Seceding states organized the Confederate States of America. The National Park Service’s Civil War Timeline traces those steps from the election through the outbreak of hostilities.
When did the Civil War start and end?
The National Park Service timeline identifies the Confederate attack on Fort Sumter as the formal beginning of the war. The conflict’s end is less neatly captured by a single surrender: Lee’s capitulation was a major endpoint, while other Confederate forces surrendered later in 1865.
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From secession to war
- November 1860: Lincoln is elected president.
- December 20, 1860: South Carolina secedes.
- January–February 1861: More states secede, and delegates organize the Confederate States of America at Montgomery.
- April 12, 1861: Confederate forces fire on Fort Sumter, beginning formal hostilities.
From Antietam to the final surrenders
- September 17, 1862: The Battle of Antietam ends Lee’s first invasion of the North. Lincoln issues a preliminary emancipation proclamation five days later.
- January 1, 1863: The final Emancipation Proclamation takes effect.
- July 1–3, 1863: The Battle of Gettysburg takes place.
- November 19, 1863: Lincoln delivers the Gettysburg Address at the dedication of the Soldiers’ National Cemetery.
- April 9, 1865: Lee surrenders to Grant at Appomattox Court House. Additional Confederate surrenders follow; the National Park Service timeline records the last large Confederate army surrendering in June and other holdouts surrendering later.
What did the Emancipation Proclamation do?
The proclamation declared enslaved people in areas still in rebellion against the United States free. It did not immediately abolish slavery everywhere in the country: its declaration was limited by geography and wartime conditions. The National Archives’ transcript records Lincoln’s announcement that “all persons held as slaves” in the designated rebellious areas “are, and henceforward shall be free.”
The war’s initial Union purpose was to prevent secession and preserve the Union, as the National Archives explains. Emancipation became a defining war aim and outcome, but Lincoln understood that the wartime proclamation alone would not ensure freedom after the conflict. The Thirteenth Amendment, rather than the proclamation by itself, abolished slavery throughout the United States.
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African Americans also served in the Union military. The National Park Service’s Antietam article reports that more than 200,000 African American men joined the Union Army.
Why was the Battle of Gettysburg important?
Gettysburg was a major battle in the war’s middle years, fought July 1–3, 1863. The Library of Congress timeline and exhibition document the battle’s place in the conflict. It followed Antietam, which had ended Lee’s first invasion of the North, and preceded Lincoln’s dedication of the Soldiers’ National Cemetery with the Gettysburg Address. These milestones place Gettysburg within a period when the Union war effort, emancipation, and the meaning of the conflict were changing.
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The National Park Service’s “What Comes Out of Antietam” gives an estimate of more than 620,000 deaths. Treat that as an attributed estimate, not an exact or universally settled count; the publication year is not stated on the source record.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the war changed
The Union was preserved, and slavery was abolished throughout the country through the Thirteenth Amendment. Those outcomes should not be collapsed into one event: preserving the Union was the initial federal war aim, emancipation developed during the conflict, and nationwide abolition required constitutional action beyond the Emancipation Proclamation. For further primary-source context, the National Archives provides the proclamation transcript; the National Park Service’s Civil War Timeline and Gettysburg overview set out the sequence and causes, while the Library of Congress’s Civil War in America exhibit gives chronology and document context.
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