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The Civil War

The conflict that tore the United States apart and abolished slavery, 1861–1865
Illustration of Union and Confederate forces in battle during the American Civil War
AI-generated

No event in American history has killed more Americans than the Civil War — and none has done more to define what the country is. Between April 1861 and April 1865, roughly 620,000 to 750,000 soldiers died, more than in all other American wars through Vietnam combined. Eleven Southern states seceded over the preservation of slavery, formed the Confederate States of America, and fought for four years against a federal government that was, at the outset, fighting only to restore the Union — not to end bondage.

The war's character transformed by degrees. Lincoln's Emancipation Proclamation of January 1, 1863, declared enslaved people in Confederate states legally free and opened the Union Army to Black soldiers — 180,000 would serve, many of them previously enslaved. The conflict also remade warfare itself: ironclad warships, repeating rifles, coordinated rail logistics, telegraph communication, and balloon reconnaissance all appeared or were perfected in the American Civil War, prefiguring the industrial slaughter of the 20th century.

The Confederacy's defeat resolved two questions that had haunted the republic since 1776: the 13th Amendment abolished slavery in December 1865, and the question of secession was settled permanently by force of arms. What the war did not resolve — the political, legal, and economic status of four million freed people — was left to Reconstruction. When Reconstruction was abandoned in 1877, the South rebuilt its racial hierarchy through law and violence, a project whose consequences echoed through every Civil Rights struggle of the next century.

The war's cultural weight remains extraordinary. More than 50,000 books have examined it. Its battlefields draw millions of visitors a year. The Confederate monument controversy — most statues were erected not in 1865 but in the early 20th century and during the Civil Rights era as deliberate acts of racial intimidation — shows the conflict's political charge has never fully dissipated. The guns stopped in 1865. The argument about what the war meant, and what it settled, has never stopped.

Antebellum Period · Civil War · Reconstruction
Timeline
November 6, 1860
Lincoln elected president
First Republican president; wins without a single Southern electoral vote
December 20, 1860
South Carolina secedes
First state to leave the Union; ten more follow by June 1861
April 12, 1861
Confederate guns fire on Fort Sumter
War begins; Union garrison surrenders after 34-hour bombardment
September 17, 1862
Battle of Antietam
Bloodiest single day in American military history; 22,000 casualties
January 1, 1863
Emancipation Proclamation takes effect
Frees enslaved people in Confederate states; transforms war aims
July 1–3, 1863
Battle of Gettysburg
Confederate invasion of the North repelled; 50,000 casualties in three days
November 16, 1864
Sherman begins March to the Sea
Union forces cut a 60-mile wide path of destruction through Georgia
April 9, 1865
Lee surrenders at Appomattox
Confederate Army of Northern Virginia surrenders; war effectively ends
April 14, 1865
Lincoln assassinated
Shot at Ford's Theatre by John Wilkes Booth; dies the following morning
December 6, 1865
Thirteenth Amendment ratified
Slavery abolished throughout the United States
Key Facts
Dates April 12, 1861 – April 9, 1865
Opening shot Confederate attack on Fort Sumter, South Carolina
Union commander Ulysses S. Grant (from March 1864)
Confederate commander Gen. Robert E. Lee
Military deaths ~620,000–750,000
Outcome Union victory; slavery abolished (13th Amendment, 1865)
At a Glance
Date April 12, 1861 – April 9, 1865
Location United States