What caused the states to secede from the Union?

In 1860, Matthew Fontaine Maury, then Superintendant of the United States National Observatory in Washington, DC, prepared “The Washington Map of the United States”. The large wall map was dedicated to George Washington and features an elaborate decorative border and is lavishly illustrated with views of Mount Vernon, the Capitol, the Washington Monument, and a silhouette of George Washington.

Matthew Fontaine Maury, noted naval officer geographer and scientist, was born in Virginia and had deep southern ties. In late April 1861 following the state of Virginia’s decision to secede from the United States, Maury resigned his commission in the United States Navy and moved from Washington, DC to Fredericksburg, Virginia where he later served In the newly formed Navy of Virginia.

Shortly after the election of Abraham Lincoln in 1860, but before his inauguration in March 1861, the United States changed dramatically. The political and economic tensions between the northern industrialized states and the southern agrarian states reached a fever pitch as states previously leaning towards secession held formal votes and left the Union in order to form what would become the “Confederate States of America”. On December 20, 1860, the state of South Carolina became the first state to secede from the Union as shown on the accompanying map entitled “Map of the United States of America showing the Boundaries of the Union and Confederate Geographical Divisions and Departments as of Dec, 31, 1860” published in the 1891 Atlas to Accompany the Official Records of the Civil War.

Six months later the states of Mississippi (January 9, 1861), Florida (January 10, 1861), Alabama (January 11, 1861), Georgia (January 19, 1861), Louisiana (January 26, 1861), Texas (February 1, 1861), Virginia (April 17, 1861), Arkansas (May 6, 1861), North Carolina (May 20, 1861), and Tennessee (June 8, 1861) formally seceded from the United States. This map, also appearing in the Atlas to Accompany the Official Records of the Civil War, shows the status of seceded states as of June 30, 1861.

When Abraham Lincoln, a known opponent of slavery, was elected president, the South Carolina legislature perceived a threat. Calling a state convention, the delegates voted to remove the state of South Carolina from the union known as the United States of America. The secession of South Carolina was followed by the secession of six more states—Mississippi, Florida, Alabama, Georgia, Louisiana, and Texas–and the threat of secession by four more—Virginia, Arkansas, Tennessee, and North Carolina. These eleven states eventually formed the Confederate States of America.

  • February 1861

    The South Creates a Government

    At a convention in Montgomery, Alabama, the seven seceding states created the Confederate Constitution, a document similar to the United States Constitution, but with greater stress on the autonomy of each state. Jefferson Davis was named provisional president of the Confederacy until elections could be held.

  • February 1861

    The South Seizes Federal Forts

    When President Buchanan—Lincoln's predecessor—refused to surrender southern federal forts to the seceding states, southern state troops seized them. At Fort Sumter, South Carolina troops repulsed a supply ship trying to reach federal forces based in the fort. The ship was forced to return to New York, its supplies undelivered.

  • March 1861

    Lincoln's Inauguration

    At Lincoln's inauguration on March 4, the new president said he had no plans to end slavery in those states where it already existed, but he also said he would not accept secession. He hoped to resolve the national crisis without warfare.

  • April 1861

    Attack on Fort Sumter

    When President Lincoln planned to send supplies to Fort Sumter, he alerted the state in advance, in an attempt to avoid hostilities. South Carolina, however, feared a trick; the commander of the fort, Robert Anderson, was asked to surrender immediately. Anderson offered to surrender, but only after he had exhausted his supplies. His offer was rejected, and on April 12, the Civil War began with shots fired on the fort. Fort Sumter eventually was surrendered to South Carolina.

  • April 1861

    Four More States Join the Confederacy

    The attack on Fort Sumter prompted four more states to join the Confederacy. With Virginia's secession, Richmond was named the Confederate capitol.

  • June 1861

    West Virginia Is Born

    Residents of the western counties of Virginia did not wish to secede along with the rest of the state. This section of Virginia was admitted into the Union as the state of West Virginia on June 20, 1863.

  • June 1861

    Four Slave States Stay in the Union

    Despite their acceptance of slavery, Delaware, Kentucky, Maryland, and Missouri did not join the Confederacy. Although divided in their loyalties, a combination of political maneuvering and Union military pressure kept these states from seceding.

    What caused the states to secede from the Union?
    View of the battlefield, First Bull Run, Virginia, July 1861

  • July 1861

    First Battle of Bull Run

    Public demand pushed General-in-Chief Winfield Scott to advance on the South before adequately training his untried troops. Scott ordered General Irvin McDowell to advance on Confederate troops stationed at Manassas Junction, Virginia. McDowell attacked on July 21, and was initially successful, but the introduction of Confederate reinforcements resulted in a Southern victory and a chaotic retreat toward Washington by federal troops.

    None of the included photographs of First Bull Run were made at the time of battle (July 21); the photographers had to wait until the Confederate Army evacuated Centreville and Manassas in March 1862. Their views of various landmarks of the previous summer are arranged according to the direction of the federal advance, a long flanking movement by Sudley's Ford.

  • July 1861

    General McDowell Is Replaced

    Suddenly aware of the threat of a protracted war and the army's need for organization and training, Lincoln replaced McDowell with General George B. McClellan.

  • July 1861

    A Blockade of the South

    To blockade the coast of the Confederacy effectively, the federal navy had to be improved. By July, the effort at improvement had made a difference and an effective blockade had begun. The South responded by building small, fast ships that could outmaneuver Union vessels.

    Port Royal, South Carolina—1861-1862

    On November 7, 1861, Captain Samuel F. Dupont's warships silenced Confederate guns in Fort Walker and Fort Beauregard. This victory enabled General Thomas W. Sherman's troops to occupy first Port Royal and then all the famous Sea Islands of South Carolina, where Timothy H. O'Sullivan recorded them making themselves at home.

    Confederate Winter Quarters—1861-1862

    These photographs show Confederate winter quarters at Manassas, Centreville, Fairfax Court House, and Falls Church, Virginia.

  • This time line was compiled by Joanne Freeman and owes a special debt to the Encyclopedia of American History by Richard B. Morris.

    What made states secede from the union?

    The decision to secede from the union was a result of the building tensions in the United States during the 1800s over the institution of slavery, states' rights, and tariffs.

    Why did 11 states seceded from the United States?

    All eleven states declared slavery as one of the primary motivators for their secession; they believed that their livelihoods were tied up with the institution of slavery, and that they could no longer be part of a country that might force them to abandon slavery.