Modern - 12 April 1861 - 9 April 1865
American Civil War
Duration
4 years
Location
United States of America
Total Dead
~620,000–750,000 dead
Wounded
~476,000 wounded
Geography & Alliances
Factions & Territories
Battle markers show key engagement locations across the United States.
Origins
Causes
Slavery
The central cause of the war was the institution of chattel slavery, upon which the Southern economy depended. Southern leaders openly declared the preservation and expansion of slavery as the cornerstone of the Confederacy. The election of Abraham Lincoln, seen as a threat to slavery's expansion, triggered secession.
States' Rights
Southern states argued that individual states retained the sovereign right to nullify federal laws or secede from the Union. The federal government and Lincoln rejected secession as unconstitutional, framing the conflict as a rebellion to be suppressed.
Economic Divergence
The industrialising North and the agrarian, slave-dependent South had developed incompatible economic systems. Tariff disputes, railroad policy, and banking differences generated persistent sectional tension throughout the antebellum period.
Territorial Expansion of Slavery
The question of whether new western territories would permit slavery intensified the sectional divide. Landmark legislation including the Missouri Compromise, the Compromise of 1850, and the Kansas-Nebraska Act each temporarily defused but ultimately deepened the conflict.
Election of Abraham Lincoln (1860)
Lincoln's election in November 1860 — without a single Southern electoral vote — was the immediate trigger for secession. South Carolina left the Union within weeks, followed by six more Deep South states before Lincoln's inauguration in March 1861.
Human Cost
Casualties
~620,000–750,000 dead
Total Dead
~360,000 Union / ~260,000 Confederate
Military
~50,000+ civilians
Civilian
~476,000 wounded
Wounded
Chronology
Timeline
Election of Abraham Lincoln
Lincoln wins the presidency without a single Southern electoral vote. South Carolina calls a secession convention within days of the result. The secession crisis begins.
Southern States Secede
South Carolina secedes on 20 December 1860, followed by Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas. The Confederate States of America is formed on 4 February 1861 with Jefferson Davis as president.
Attack on Fort Sumter
Confederate forces under General P.G.T. Beauregard open fire on the Union garrison at Fort Sumter, South Carolina. The fort surrenders after 34 hours. Lincoln calls for 75,000 volunteers; four more states secede to join the Confederacy.
First Battle of Bull Run
Confederate forces rout Union troops near Manassas, Virginia, sending panicked civilians who had come to watch fleeing back to Washington. The reality of a long, brutal war sets in for both sides.
Emancipation Proclamation Announced
Following Antietam, Lincoln issues the preliminary Emancipation Proclamation, declaring that all enslaved people in Confederate states will be free from 1 January 1863. It transforms the war's moral dimension and deters European intervention.
Battle of Gettysburg
The war's greatest battle ends with the defeat of Lee's Army of Northern Virginia. On 19 November, Lincoln delivers the Gettysburg Address at the dedication of the Soldiers' National Cemetery, reframing the war as a fight for human equality.
Vicksburg Falls
Grant accepts the surrender of Vicksburg, giving the Union control of the entire Mississippi River and splitting the Confederacy in two. The western Confederacy is now effectively cut off.
Grant's Overland Campaign
Grant relentlessly pursues Lee through the Wilderness, Spotsylvania, and Cold Harbor, absorbing catastrophic casualties but maintaining constant pressure. The Union's ability to replace losses and the Confederacy's inability to do so seals the strategic outcome.
Fall of Atlanta
Sherman captures Atlanta, delivering a crucial political victory for Lincoln ahead of the November election. Lincoln wins re-election decisively, ensuring the war will be fought to unconditional Confederate surrender.
Sherman's March to the Sea
Sherman leads 60,000 troops from Atlanta to Savannah, deliberately destroying Confederate infrastructure and supplies across a 60-mile-wide corridor. The march breaks the South's will to fight and demonstrates that the Confederacy cannot protect its own territory.
Thirteenth Amendment Passes Congress
The House of Representatives passes the Thirteenth Amendment, permanently abolishing slavery throughout the United States. Ratified in December 1865.
Lee Surrenders at Appomattox
General Robert E. Lee surrenders the Army of Northern Virginia to Ulysses S. Grant at Appomattox Court House, Virginia. Grant allows Confederate soldiers to return home on parole. The remaining Confederate armies surrender within weeks.
Assassination of Abraham Lincoln
President Lincoln is shot by Confederate sympathiser John Wilkes Booth at Ford's Theatre in Washington. He dies the following morning. The nation is plunged into mourning and the question of Reconstruction is left to his successor, Andrew Johnson.
Combat
Major Battles
First Battle of Bull Run
1861Prince William County, Virginia
Confederate victory
Shattered Northern illusions of a quick, easy war. Union forces routed, and Washington D.C. briefly feared Confederate attack. Both sides began serious mobilisation for a prolonged conflict.
Battle of Shiloh
1862Hardin County, Tennessee
Union victory
One of the war's bloodiest early battles with ~23,000 casualties in two days. Grant's forces narrowly avoided defeat; the scale of carnage shocked both sides and ended hopes of a short war in the West.
Battle of Antietam
1862Sharpsburg, Maryland
Union strategic victory
The bloodiest single day in American military history (~22,720 casualties). Lee's first northern invasion was repulsed, giving Lincoln the political cover to issue the Emancipation Proclamation five days later.
Battle of Fredericksburg
1862Fredericksburg, Virginia
Confederate victory
A catastrophic Union frontal assault on entrenched Confederate positions resulted in ~12,600 Union casualties. One of the Army of the Potomac's worst defeats.
Battle of Chancellorsville
1863Spotsylvania County, Virginia
Confederate victory
Lee's tactical masterpiece — defeated a Union force twice his size. However, Stonewall Jackson was accidentally shot by his own troops and died, depriving the Confederacy of its finest corps commander.
Battle of Gettysburg
1863Gettysburg, Pennsylvania
Union victory
The war's turning point in the East. Lee's second northern invasion ended in catastrophic failure. Pickett's Charge on the third day resulted in over 6,000 Confederate casualties in under an hour. The Confederacy never invaded the North again.
Siege of Vicksburg
1863Vicksburg, Mississippi
Union victory
Grant's capture of Vicksburg on 4 July 1863 split the Confederacy in two by securing Union control of the Mississippi River. Combined with Gettysburg, it marked the decisive strategic turning point of the war.
Battle of Chickamauga
1863Walker County, Georgia
Confederate victory
The Confederacy's last major victory in the West. ~34,000 total casualties made it the bloodiest battle of the Western Theater. Union forces were saved by George Thomas — "The Rock of Chickamauga."
Battle of the Wilderness
1864Orange County, Virginia
Indecisive
Grant's first engagement against Lee as general-in-chief. Unlike his predecessors, Grant refused to retreat after the bloody stalemate and pushed south, initiating the grinding Overland Campaign that would ultimately end the war.
Battle of Atlanta
1864Atlanta, Georgia
Union victory
Sherman's capture of Atlanta on 2 September 1864 revitalised Northern morale and virtually guaranteed Lincoln's re-election, ensuring the war would be prosecuted to total victory over the Confederacy.
Battle of Appomattox Court House
1865Appomattox Court House, Virginia
Union victory
Lee surrendered the Army of Northern Virginia to Grant on 9 April 1865, effectively ending the Civil War. Grant's generous terms — soldiers paroled, officers allowed to keep sidearms — set the tone for a magnanimous, if incomplete, reconciliation.
Leaders & Commanders
Key Figures
Union
President of the United States; led the Union war effort and issued the Emancipation Proclamation
Ulysses S. Grant
Union general-in-chief; accepted Lee's surrender at Appomattox
William Tecumseh Sherman
Union general; led the March to the Sea through Georgia
George B. McClellan
Union general; built the Army of the Potomac but was cautious in command
George Thomas
Union general known as "The Rock of Chickamauga" for saving the Union army
Frederick Douglass
Abolitionist, orator, and adviser to Lincoln; prominent voice for emancipation and Black soldiers
Harriet Tubman
Abolitionist and Union spy; led the Combahee River Raid freeing 700 enslaved people
Confederacy
Jefferson Davis
President of the Confederate States of America
Robert E. Lee
Commander of the Confederate Army of Northern Virginia
Thomas "Stonewall" Jackson
Confederate general and Lee's most trusted lieutenant; died at Chancellorsville
James Longstreet
Lee's senior corps commander; later reconciled with the Union and supported Reconstruction
John Wilkes Booth
Confederate sympathiser who assassinated President Lincoln on 14 April 1865
Innovation
Technologies of War
Rifled Musket
The widespread adoption of the rifled musket (particularly the Springfield and Enfield) gave infantry far greater accuracy and range than earlier smoothbore weapons. Tactics inherited from Napoleonic warfare — close-order charges — became suicidal, driving soldiers into trenches and producing the war's massive casualties.
Ironclad Warships
The clash of the USS Monitor and CSS Virginia (Merrimack) on 9 March 1862 marked the end of wooden warship warfare. Ironclad vessels revolutionised naval combat and spurred rapid naval innovation in Europe and beyond.
Telegraph
The electric telegraph allowed Lincoln and his generals to communicate in near real time across the continent — the first war in which strategic command could be exercised instantly over vast distances. Lincoln spent hours in the War Department telegraph office monitoring the front.
Railroads
Railways were decisive in moving troops and supplies at unprecedented speed. The Union's far superior railroad network — and its ability to repair lines faster than the Confederacy could destroy them — was a critical strategic advantage throughout the war.
Repeating Rifles
Weapons such as the Spencer and Henry repeating rifles allowed Union cavalry and infantry units to fire multiple rounds without reloading. Confederate soldiers who faced them remarked they were "loaded on Sunday and fired all week."
Ironclad Siege Artillery
Heavy rifled siege artillery enabled the systematic reduction of fortifications that had previously been considered impregnable. The Siege of Vicksburg and the siege lines around Petersburg demonstrated modern siege warfare principles that anticipated 20th-century trench warfare.
Legacy
Historical Significance
The Civil War ended slavery in the United States, preserved the Union, and transformed the federal government into the dominant authority over the states. The Thirteenth Amendment abolished slavery permanently. The conflict established the principle that secession was illegal and that the nation was an indivisible republic. Its unresolved tensions over race and equality continued to shape American society for over a century through Reconstruction, Jim Crow, and beyond.
Consequences
Abolition of Slavery — Thirteenth Amendment
Ratified on 6 December 1865, the Thirteenth Amendment permanently abolished slavery in the United States, freeing approximately four million enslaved people. It was the most transformative legal act in American history since the Constitution.
Reconstruction (1865–1877)
The federal government attempted to reintegrate the Southern states and guarantee civil rights to freed Black Americans. Constitutional amendments (14th and 15th) granted citizenship and voting rights. However, Reconstruction was ultimately abandoned in 1877, leaving Black Southerners vulnerable to systematic oppression.
Rise of Jim Crow
Following the withdrawal of federal troops, Southern states enacted "Black Codes" and later Jim Crow laws that enforced racial segregation and disenfranchisement. The promise of emancipation was systematically undermined for nearly a century.
The Lost Cause Mythology
Southern culture propagated the "Lost Cause" narrative — portraying the Confederacy as a noble cause fighting for states' rights rather than slavery. This mythology shaped American memory of the war, fuelled monument-building campaigns, and distorted public understanding of the conflict for generations.
National Reunification
Despite the war's bitterness, the Union was preserved and the principle that states could not unilaterally secede was firmly established. The federal government emerged permanently strengthened relative to the states, laying the foundation for modern American governance.
Industrial and Economic Transformation
The war accelerated Northern industrialisation and demonstrated the strategic value of industry, railroads, and mass production. The South's agrarian economy was devastated; it would remain economically behind the North for decades.
Did You Know?
Facts
Fact 1
The Bloodiest American War
More Americans died in the Civil War than in all other American wars combined up to and including World War II. Estimates range from 620,000 to 750,000 dead, with disease killing roughly twice as many soldiers as combat wounds.
Fact 2
180,000 Black Soldiers Served in the Union Army
Nearly 180,000 African Americans served in the United States Colored Troops (USCT), comprising roughly 10% of the Union army by war's end. They fought in over 400 engagements and were central to Union victory.
Fact 3
The Gettysburg Address Was Delivered in Two Minutes
Lincoln's Gettysburg Address — widely considered the greatest speech in American history — was only 272 words long. The main speaker of the day, Edward Everett, spoke for two hours. Contemporary press barely noted Lincoln's remarks.
Fact 4
Pickett's Charge Lost Over Half Its Men
On 3 July 1863, roughly 12,500 Confederate soldiers marched across open ground toward Union lines on Cemetery Ridge. The assault lasted less than an hour; more than 6,500 were killed, wounded, or captured. It was the high-water mark of the Confederacy.
Fact 5
Sherman's March Destroyed $100 Million in Property
Sherman's troops systematically destroyed railroads, factories, and food supplies across Georgia and the Carolinas. The campaign pioneered the doctrine of "total war" — targeting the economic and psychological infrastructure of the enemy.
Fact 6
Lincoln Was the First U.S. President Assassinated
John Wilkes Booth shot Lincoln at Ford's Theatre on 14 April 1865, just five days after Lee's surrender. Lincoln died the following morning, denying the nation the leadership of the one man best positioned to guide a just Reconstruction.
See Also
Related Figures
"A house divided against itself cannot stand."
Abraham Lincoln, House Divided Speech, Springfield, Illinois, 16 June 1858