When was civil war

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Last updated: April 17, 2026

Quick Answer: The American Civil War began on April 12, 1861, when Confederate forces attacked Fort Sumter in South Carolina. It ended on April 9, 1865, with General Robert E. Lee's surrender at Appomattox Court House, after over 620,000 estimated military deaths.

Key Facts

The American Civil War started on April 12, 1861, with the Confederate attack on Fort Sumter.
The war ended on April 9, 1865, when General Robert E. Lee surrendered to Ulysses S. Grant.
Over 620,000 soldiers died, making it the deadliest conflict in U.S. history.
The Emancipation Proclamation was issued by President Abraham Lincoln on January 1, 1863.
The 13th Amendment, abolishing slavery, was ratified on December 6, 1865.

Overview

The American Civil War was a defining conflict in United States history, fought between the Union (Northern states) and the Confederacy (Southern states) from 1861 to 1865. Sparked by deep divisions over slavery, states' rights, and economic differences, the war reshaped the nation’s political and social landscape.

President Abraham Lincoln’s election in 1860 triggered the secession of eleven Southern states, which formed the Confederate States of America. The war officially began when Confederate troops bombarded Fort Sumter in Charleston Harbor, South Carolina, on April 12, 1861.

April 12, 1861: The Civil War began with the Confederate assault on Fort Sumter, marking the first military engagement of the conflict.
Over 3 million soldiers: Approximately 2.1 million fought for the Union and 1 million for the Confederacy, making it the largest mobilization in U.S. history to that point.
620,000 estimated deaths: More Americans died in the Civil War than in any other U.S. conflict, with recent estimates suggesting the number may exceed 750,000.
Emancipation Proclamation: Issued on January 1, 1863, it declared freedom for slaves in Confederate-held territory, shifting the war’s purpose to include ending slavery.
Gettysburg Address: Delivered by Lincoln in November 1863, it redefined the war as a struggle for equality and a "new birth of freedom."

How It Works

The Civil War operated through military campaigns, political decisions, and social upheaval, driven by industrial capacity, manpower, and leadership. Key events and policies shaped its course and outcome.

Term: Secession: Between December 1860 and June 1861, eleven Southern states seceded from the Union, forming the Confederate States of America with Jefferson Davis as president.
Term: Total War: Union generals like William T. Sherman used total war tactics, destroying infrastructure and resources in Georgia and the Carolinas to break Confederate morale.
Term: Draft: The Union instituted a military draft in 1863, leading to violent protests such as the New York City Draft Riots, which killed over 100 people.
Term: Ironclads: The 1862 Battle of Hampton Roads featured the first clash between ironclad warships, the USS Monitor and CSS Virginia, revolutionizing naval warfare.
Term: 13th Amendment: Ratified on December 6, 1865, it formally abolished slavery throughout the United States, fulfilling a central war aim of the Union.
Term: Appomattox: On April 9, 1865, General Robert E. Lee surrendered to General Ulysses S. Grant at Appomattox Court House, effectively ending major combat operations.

Comparison at a Glance

Key differences between the Union and Confederacy influenced the war’s outcome:

Factor	Union (North)	Confederacy (South)
Population	Over 22 million people	About 9 million, including 3.5 million enslaved people
Industrial Capacity	90% of U.S. manufacturing; vast rail network	Limited industry; relied on agriculture
Naval Power	Controlled the U.S. Navy; enforced blockade	Few ships; relied on blockade runners
Leadership	Abraham Lincoln; Generals U.S. Grant and W.T. Sherman	Jefferson Davis; Generals Robert E. Lee and Stonewall Jackson
War Aims	Preserve the Union; later, end slavery	Secede and protect slavery

The Union’s superior resources, population, and industrial base gave it a decisive advantage. The naval blockade crippled Southern trade, while the North’s ability to mobilize troops and supplies steadily overwhelmed Confederate forces.

Why It Matters

The Civil War fundamentally transformed the United States, ending slavery and redefining federal authority. Its legacy continues to influence American society, politics, and civil rights.

Ended slavery: The 13th Amendment abolished slavery, freeing nearly 4 million enslaved people across the South.
Strengthened federal power: The war settled the debate over secession, affirming that states could not unilaterally leave the Union.
Reconstruction Era: From 1865 to 1877, the federal government attempted to rebuild the South and integrate freed slaves into society.
Changed warfare: The use of railroads, telegraphs, and trench warfare foreshadowed modern military tactics.
Cultural memory: Monuments, literature, and education continue to grapple with the war’s meaning and legacy.
Civil rights foundation: The 14th and 15th Amendments, passed during Reconstruction, laid the legal groundwork for future civil rights movements.

The Civil War remains a pivotal chapter in American history, symbolizing both the cost of division and the possibility of national renewal through unity and justice.