Span of control
Map of the division of the states in the American Civil War
(1861–1865). Blue indicates the northern Union states; light blue represents five Union states that permitted slavery (border states
). Red represents southern seceded states in rebellion, also known as the Confederate States of America. Uncolored areas were U.S. territories, with the exception of the Indian Territory
On February 22, 1862, the Confederate Constitution of seven state signatories – Mississippi, South Carolina, Florida, Alabama, Georgia, Louisiana, and Texas – replaced the Provisional Constitution of February 8, 1861, with one stating in its preamble a desire for a "permanent federal government". Four additional slave-holding states – Virginia, Arkansas, Tennessee, and North Carolina – declared their secession and joined the Confederacy following a call by U.S. President Abraham Lincoln for troops from each state to recapture Sumter and other seized federal properties in the South.
Missouri and Kentucky were represented by partisan factions adopting the forms of state governments without control of substantial territory or population in either case. The antebellum state governments in both maintained their representation in the Union. Also fighting for the Confederacy were two of the "Five Civilized Tribes" – the Choctaw and the Chickasaw – in Indian Territory and a new, but uncontrolled, Confederate Territory of Arizona. Efforts by certain factions in Maryland to secede were halted by federal imposition of martial law; Delaware, though of divided loyalty, did not attempt it. A Unionist government was formed in opposition to the secessionist state government in Richmond and administered the western parts of Virginia that had been occupied by Federal troops. The Restored Government of Virginia later recognized the new state of West Virginia, which was admitted to the Union during the war on June 20, 1863, and relocated to Alexandria for the rest of the war.
Confederate control over its claimed territory and population in congressional districts steadily shrank from three-quarters to a third during the course of the American Civil War due to the Union's successful overland campaigns, its control of inland waterways into the South, and its blockade of the southern coast. With the Emancipation Proclamation on January 1, 1863, the Union made abolition of slavery a war goal (in addition to reunion). As Union forces moved southward, large numbers of plantation slaves were freed. Many joined the Union lines, enrolling in service as soldiers, teamsters and laborers. The most notable advance was Sherman's "March to the Sea" in late 1864. Much of the Confederacy's infrastructure was destroyed, including telegraphs, railroads and bridges. Plantations in the path of Sherman's forces were severely damaged. Internal movement within the Confederacy became increasingly difficult, weakening its economy and limiting army mobility.
These losses created an insurmountable disadvantage in men, materiel, and finance. Public support for Confederate President Jefferson Davis's administration eroded over time due to repeated military reverses, economic hardships, and allegations of autocratic government. After four years of campaigning, Richmond was captured by Union forces in April 1865. A few days later General Robert E. Lee surrendered to Union General Ulysses S. Grant, effectively signalling the collapse of the Confederacy. President Davis was captured on May 10, 1865, and jailed for treason, but no trial was ever held.