American Civil War Anniversary: Key Dates Explained

When Is the American Civil War Anniversary? (2026–2031)

American Civil War Anniversary — Date, History & Current Status Explained

The American Civil War began on April 12, 1861, when Confederate forces opened fire on Fort Sumter in Charleston Harbor, South Carolina. April 12 is not an official public holiday in the United States, and government offices, schools, and businesses remain open on this date.

April 12, 2026 marks the 165th anniversary of the attack on Fort Sumter. Because the anniversary is not a federal or state holiday, it moves through every day of the week without any change to standard business hours, mail delivery, or school schedules.

What Started the American Civil War?

The Civil War grew out of decades of escalating conflict between the Northern and Southern United States over slavery, its expansion into new territories, and the balance of political power between free and slave states. South Carolina became the first state to secede from the Union on December 20, 1860, shortly after the election of President Abraham Lincoln, and ten more Southern states followed by mid-1861 to form the Confederate States of America. Multiple state secession declarations of the period, including South Carolina’s, explicitly named the protection of slavery as a central reason for leaving the Union. Historians also point to disputes over states’ rights and sectional economic differences as contributing factors, though most historians identify the preservation and expansion of slavery as the war’s principal cause.

On the morning of April 12, 1861, Confederate artillery under General P.G.T. Beauregard opened fire on the Union-held Fort Sumter after federal commander Major Robert Anderson declined an order to surrender. The bombardment lasted roughly 34 hours before Anderson’s garrison surrendered on April 13. No soldiers on either side were killed during the exchange, though the attack triggered President Lincoln’s call for 75,000 militia volunteers and pushed four additional slave states — Virginia, Arkansas, Tennessee, and North Carolina — to join the Confederacy.

Key Events of the Civil War (1861–1865)

The war lasted four years and involved more than three million soldiers across the Union and Confederate armies. Major turning points shaped both the military and political course of the conflict.

The Battle of Antietam (September 17, 1862), fought in Maryland, remains the single bloodiest day in American military history, with roughly 23,000 combined casualties. The Union’s tactical advantage gave Lincoln the political opening to issue the preliminary Emancipation Proclamation five days later.

The Emancipation Proclamation took effect on January 1, 1863, declaring enslaved people in Confederate-held territory free and authorizing the enlistment of Black soldiers into the Union Army. Roughly 180,000 Black soldiers ultimately served in the U.S. Colored Troops.

The Battle of Gettysburg (July 1–3, 1863) turned back General Robert E. Lee’s second invasion of the North and is widely regarded as the war’s military turning point. Lincoln later delivered the Gettysburg Address at the battlefield’s dedication in November 1863.

Sherman’s March to the Sea (November–December 1864) saw Union forces under General William T. Sherman cut a path of destruction through Georgia, undermining the Confederacy’s ability to supply its remaining armies.

How and When Did the Civil War End?

General Robert E. Lee surrendered the Army of Northern Virginia to Union General Ulysses S. Grant at Appomattox Court House, Virginia, on April 9, 1865. Remaining Confederate forces surrendered over the following weeks, with the last significant Confederate army standing down by late May 1865. President Lincoln was assassinated on April 14, 1865, five days after Lee’s surrender, and died the following morning. Historians generally treat April 9, 1865 as the war’s effective end, though some Confederate units did not formally surrender until June 1865. The war produced an estimated 620,000 to 750,000 military deaths, the highest toll of any conflict in U.S. history.

Is There an Official Civil War Remembrance Day?

The United States has no single federal holiday marking either the start or end of the Civil War. Several related observances exist at the federal and state level instead. Memorial Day, observed on the last Monday in May, originated in the years after the Civil War as a day to honor fallen Union soldiers and has since expanded to honor all U.S. military dead. A small number of Southern states maintain separate state-level Confederate Memorial Day observances on dates that vary by state, which are not recognized federally. Juneteenth, marking the June 19, 1865 announcement of the end of slavery in Texas, became a federal holiday in 2021 and is tied to the war’s conclusion and the enforcement of emancipation.

Frequently Asked Questions about the American Civil War

Q: What date did the Civil War start?
A: The Civil War started on April 12, 1861, with the Confederate attack on Fort Sumter in Charleston, South Carolina. The siege ended with the fort’s surrender the next day.

Q: What date did the Civil War end?
A: The Civil War is generally dated to April 9, 1865, when General Lee surrendered at Appomattox Court House. Some Confederate units continued fighting into June 1865.

Q: Is April 12 a federal holiday in the United States?
A: No, April 12 is not a federal or state holiday. Government offices, schools, and businesses operate on their normal schedules.

Q: How many years did the Civil War last?
A: The Civil War lasted just over four years, from April 1861 to April–June 1865.

Q: What was the main cause of the Civil War?
A: Most historians identify the preservation and expansion of slavery as the central cause, based on the secession declarations issued by Southern states in 1860 and 1861. States’ rights and economic disputes are also cited as contributing factors.

Q: How many soldiers died in the Civil War?
A: Historians estimate the war caused between 620,000 and 750,000 military deaths, more than any other conflict in U.S. history.

Q: Which states seceded from the Union?
A: Eleven states seceded to form the Confederacy: South Carolina, Mississippi, Florida, Alabama, Georgia, Louisiana, Texas, Virginia, Arkansas, Tennessee, and North Carolina.

Q: What is the difference between the Civil War anniversary and Memorial Day?
A: The Civil War anniversary marks specific historical dates like April 12, 1861 or April 9, 1865. Memorial Day is a separate federal holiday, observed on the last Monday in May, that honors all fallen U.S. service members.

For monthly planning around this date, see the April 2027 calendar.

According to the National Park Service, which manages the Fort Sumter and Fort Moultrie National Historical Park, the April 12, 1861 bombardment opened the war that redefined American freedom. The Library of Congress also maintains a primary-source timeline covering the Civil War and Reconstruction period for further research.