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The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a
civil war A civil war or intrastate war is a war between organized groups within the same state (or country). The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies ...
in the
United States The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territori ...
. It was fought between the
Union Union commonly refers to: * Trade union, an organization of workers * Union (set theory), in mathematics, a fundamental operation on sets Union may also refer to: Arts and entertainment Music * Union (band), an American rock group ** ''Un ...
("the North") and the Confederacy ("the South"), the latter formed by
state State may refer to: Arts, entertainment, and media Literature * ''State Magazine'', a monthly magazine published by the U.S. Department of State * ''The State'' (newspaper), a daily newspaper in Columbia, South Carolina, United States * ''Our S ...
s that had seceded. The central cause of the war was the dispute over whether
slavery Slavery and enslavement are both the state and the condition of being a slave—someone forbidden to quit one's service for an enslaver, and who is treated by the enslaver as property. Slavery typically involves slaves being made to perf ...
would be permitted to expand into the western territories, leading to more slave states, or be prevented from doing so, which was widely believed would place slavery on a course of ultimate extinction. Decades of political controversy over slavery were brought to a head by the victory in the 1860 U.S. presidential election of
Abraham Lincoln Abraham Lincoln ( ; February 12, 1809 – April 15, 1865) was an American lawyer, politician, and statesman who served as the 16th president of the United States from 1861 until his assassination in 1865. Lincoln led the nation thro ...
, who opposed slavery's expansion into the west. An initial seven southern
slave states In the United States before 1865, a slave state was a state in which slavery and the internal or domestic slave trade were legal, while a free state was one in which they were not. Between 1812 and 1850, it was considered by the slave states ...
responded to Lincoln's victory by seceding from the United States and, in 1861, forming the Confederacy. The Confederacy seized U.S. forts and other federal assets within their borders. Led by Confederate President Jefferson Davis, the Confederacy ultimately came to control over half of U.S. territory in eleven of the 34 U.S. states that then existed. Four years of intense combat, mostly in the South, ensued. During 1861–1862 in the war's Western Theater, the Union made significant permanent gainsthough in the war's Eastern Theater the conflict was inconclusive. The abolition of slavery became a war goal on January 1, 1863, when Lincoln issued the Emancipation Proclamation and declared all slaves in states in rebellion to be free, affecting more than 3.5 million of the 4 million enslaved people in the country. To the west, the Union destroyed the Confederate's river navy by the summer of 1862, then much of its western armies, and seized
New Orleans New Orleans ( , ,New Orleans
. The successful 1863 Union
siege of Vicksburg The siege of Vicksburg (May 18 – July 4, 1863) was the final major military action in the Vicksburg campaign of the American Civil War. In a series of maneuvers, Union Maj. Gen. Ulysses S. Grant and his Army of the Tennessee crossed the Mis ...
split the Confederacy in two at the
Mississippi River The Mississippi River is the second-longest river and chief river of the second-largest drainage system in North America, second only to the Hudson Bay drainage system. From its traditional source of Lake Itasca in northern Minnesota, it fl ...
. In 1863, Confederate General Robert E. Lee's incursion north ended at the
Battle of Gettysburg The Battle of Gettysburg () was fought July 1–3, 1863, in and around the town of Gettysburg, Pennsylvania, by Union and Confederate forces during the American Civil War. In the battle, Union Major General George Meade's Army of the Po ...
. Western successes led to General Ulysses S. Grant's command of all Union armies in 1864. Inflicting an ever-tightening naval blockade of Confederate ports, the Union marshaled resources and manpower to attack the Confederacy from all directions. This led to the fall of Atlanta in 1864 to Union General
William Tecumseh Sherman William Tecumseh Sherman ( ; February 8, 1820February 14, 1891) was an American soldier, businessman, educator, and author. He served as a general in the Union Army during the American Civil War (1861–1865), achieving recognition for his com ...
, followed by his march to the sea. The last significant battles raged around the ten-month
Siege of Petersburg The Richmond–Petersburg campaign was a series of battles around Petersburg, Virginia, fought from June 9, 1864, to March 25, 1865, during the American Civil War. Although it is more popularly known as the Siege of Petersburg, it was not a cla ...
, gateway to the Confederate capital of Richmond. The Confederates abandoned Richmond, and on April 9, 1865, Lee surrendered to Grant following the Battle of Appomattox Court House, setting in motion the end of the war. A wave of Confederate surrenders followed. On April 14, just five days after Lee's surrender, Lincoln was assassinated. As a practical matter, the war ended with the May 26 surrender of the Department of the Trans-Mississippi but the
conclusion of the American Civil War The conclusion of the American Civil War commenced with the articles of surrender agreement of the Army of Northern Virginia on April 9, at Appomattox Court House, by General Robert E. Lee and concluded with the surrender of the '' Shenand ...
lacks a clear and precise historical end date. Confederate ground forces continued surrendering past the May 26 surrender date until June 23. By the end of the war, much of the South's infrastructure was destroyed, especially its railroads. The Confederacy collapsed, slavery was abolished, and four million enslaved black people were freed. The war-torn nation then entered the Reconstruction era in an attempt to rebuild the country, bring the former Confederate states back into the United States, and grant
civil rights Civil and political rights are a class of rights that protect individuals' freedom from infringement by governments, social organizations, and private individuals. They ensure one's entitlement to participate in the civil and political life o ...
to freed slaves. The Civil War is one of the most extensively studied and written about episodes in U.S. history. It remains the subject of cultural and historiographical debate. Of particular interest is the persisting myth of the
Lost Cause of the Confederacy The Lost Cause of the Confederacy (or simply Lost Cause) is an American pseudohistorical negationist mythology that claims the cause of the Confederate States during the American Civil War was just, heroic, and not centered on slavery. Fir ...
. The American Civil War was among the first wars to utilize industrial warfare. Railroads, the
telegraph Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas p ...
, steamships, the
ironclad warship An ironclad is a steam-propelled warship protected by iron or steel armor plates, constructed from 1859 to the early 1890s. The ironclad was developed as a result of the vulnerability of wooden warships to explosive or incendiary shells. Th ...
, and mass-produced weapons were all widely used during the war. In total, the war left between 620,000 and 750,000 soldiers dead, along with an undetermined number of
civilian casualties Civilian casualties occur when civilians are killed or injured by non-civilians, mostly law enforcement officers, military personnel, rebel group forces, or terrorists. Under the law of war, it refers to civilians who perish or suffer wounds as ...
, making the Civil War the deadliest military conflict in American history. The technology and brutality of the Civil War foreshadowed the coming
World Wars A world war is an international conflict which involves all or most of the world's major powers. Conventionally, the term is reserved for two major international conflicts that occurred during the first half of the 20th century, World WarI (1914 ...
.


Causes of secession

The causes behind Southern states' decision to secede were complex and have been historically controversial; most academic scholars identify slavery as the central cause of the war. The causes are further complicated by some
historical revisionists In historiography, historical revisionism is the reinterpretation of a historical account. It usually involves challenging the orthodox (established, accepted or traditional) views held by professional scholars about a historical event or times ...
who have tried to offer a variety of reasons for the war. Slavery was the central source of escalating political tension in the 1850s. The Republican Party was determined to prevent any spread of slavery to the territories, which, after they were admitted as states, would give the North greater representation in Congress and the Electoral College. Many Southern leaders had threatened secession if the Republican candidate, Lincoln, won the 1860 election. After Lincoln won, many Southern leaders felt that disunion was their only option, fearing that the loss of representation would hamper their ability to enact pro-slavery laws and policies. In his second inaugural address, Lincoln said that "slaves constituted a peculiar and powerful interest. All knew that this interest was, somehow, the cause of the war. To strengthen, perpetuate, and extend this interest was the object for which the insurgents would rend the Union, even by war; while the government claimed no right to do more than to restrict the territorial enlargement of it."


Slavery

Disagreements among states about the future of slavery were the main cause of disunion and the subsequent war itself. Slavery had been a controversial issue during the framing of the
Constitution A constitution is the aggregate of fundamental principles or established precedents that constitute the legal basis of a polity, organisation or other type of entity and commonly determine how that entity is to be governed. When these princ ...
but had been left unsettled. The issue of slavery had confounded the nation since its inception, and increasingly separated the United States into a slaveholding South and a free North. The issue was exacerbated by the rapid territorial expansion of the country, which repeatedly brought to the fore the issue of whether new territory should be slaveholding or free. The issue had dominated politics for decades leading up to the war. Key attempts to solve the issue included the
Missouri Compromise The Missouri Compromise was a federal legislation of the United States that balanced desires of northern states to prevent expansion of slavery in the country with those of southern states to expand it. It admitted Missouri as a slave state and ...
and the
Compromise of 1850 The Compromise of 1850 was a package of five separate bills passed by the United States Congress in September 1850 that defused a political confrontation between slave and free states on the status of territories acquired in the Mexican–Am ...
, but these only postponed an inevitable showdown over slavery. The motivations of the average person were not necessarily those of their faction; some Northern soldiers were indifferent on the subject of slavery, but a general pattern can be established. Confederate soldiers fought the war primarily to protect a Southern society of which slavery was an integral part. Opponents of slavery considered slavery an anachronistic evil incompatible with
republicanism Republicanism is a political ideology centered on citizenship in a state organized as a republic. Historically, it emphasises the idea of self-rule and ranges from the rule of a representative minority or oligarchy to popular sovereignty. It ...
. The strategy of the anti-slavery forces was containment—to stop the expansion of slavery and thereby put it on a path to ultimate extinction. The slaveholding interests in the South denounced this strategy as infringing upon their constitutional rights. Southern whites believed that the emancipation of slaves would destroy the South's economy, because of the large amount of capital invested in slaves and fears of integrating the ex-slave black population. In particular, many Southerners feared a repeat of the
1804 Haiti massacre The 1804 Haiti massacre also known as the 1804 Haitian Genocide or simply the Haitian Genocide was carried out by Afro-Haitian soldiers, mostly former slaves, under orders from Jean-Jacques Dessalines against the remaining European population in ...
(referred to at the time as "the horrors of Santo Domingo"), in which former slaves systematically murdered most of what was left of the country's white population—including men, women, children, and even many sympathetic to abolition—after the successful slave revolt in Haiti. Historian Thomas Fleming points to the historical phrase "a disease in the public mind" used by critics of this idea and proposes it contributed to the segregation in the Jim Crow era following emancipation. These fears were exacerbated by the 1859 attempt of John Brown to instigate an armed slave rebellion in the South.


Abolitionists

The
abolitionists Abolitionism, or the abolitionist movement, is the movement to end slavery. In Western Europe and the Americas, abolitionism was a historic movement that sought to end the Atlantic slave trade and liberate the enslaved people. The Britis ...
—those advocating the end of slavery—were active in the decades leading up to the Civil War. They traced their philosophical roots back to the
Puritans The Puritans were English Protestants in the 16th and 17th centuries who sought to purify the Church of England of Roman Catholic practices, maintaining that the Church of England had not been fully reformed and should become more Protestant. ...
, who believed that slavery was morally wrong. One of the early Puritan writings on this subject was ''The Selling of Joseph,'' by
Samuel Sewall Samuel Sewall (; March 28, 1652 – January 1, 1730) was a judge, businessman, and printer in the Province of Massachusetts Bay, best known for his involvement in the Salem witch trials, for which he later apologized, and his essay ''The Selling ...
in 1700. In it, Sewall condemned slavery and the slave trade and refuted many of the era's typical justifications for slavery.McCullough, David. ''John Adams,'' pp. 132–3, Simon & Schuster, New York, New York, 2001. . The
American Revolution The American Revolution was an ideological and political revolution that occurred in British America between 1765 and 1791. The Americans in the Thirteen Colonies formed independent states that defeated the British in the American Revoluti ...
and the cause of liberty added tremendous impetus to the abolitionist cause. Slavery, which had been around for thousands of years, was considered normal and was not a significant issue of public debate prior to the Revolution. The Revolution changed that and made it into an issue that had to be addressed. As a result, during and shortly after the Revolution, the Northern states quickly started outlawing slavery. Even in Southern states, laws were changed to limit slavery and facilitate
manumission Manumission, or enfranchisement, is the act of freeing enslaved people by their enslavers. Different approaches to manumission were developed, each specific to the time and place of a particular society. Historian Verene Shepherd states that t ...
. The amount of indentured servitude dropped dramatically throughout the country. An Act Prohibiting Importation of Slaves sailed through Congress with little opposition. President
Thomas Jefferson Thomas Jefferson (April 13, 1743 – July 4, 1826) was an American statesman, diplomat, lawyer, architect, philosopher, and Founding Father who served as the third president of the United States from 1801 to 1809. He was previously the natio ...
supported it, and it went into effect on January 1, 1808, which was the first day that the Constitution (Article I, section 9, clause 1) permitted Congress to prohibit the importation of slaves.
Benjamin Franklin Benjamin Franklin ( April 17, 1790) was an American polymath who was active as a writer, scientist, inventor, statesman, diplomat, printer, publisher, and political philosopher. Encyclopædia Britannica, Wood, 2021 Among the leading inte ...
and
James Madison James Madison Jr. (March 16, 1751June 28, 1836) was an American statesman, diplomat, and Founding Father. He served as the fourth president of the United States from 1809 to 1817. Madison is hailed as the "Father of the Constitution" for h ...
each helped found manumission societies. Influenced by the Revolution, many slave owners freed their slaves, but some, such as
George Washington George Washington (February 22, 1732, 1799) was an American military officer, statesman, and Founding Father who served as the first president of the United States from 1789 to 1797. Appointed by the Continental Congress as commander of ...
, did so only in their wills. The number of free black people as a proportion of the black population in the
upper South The Upland South and Upper South are two overlapping cultural and geographic subregions in the inland part of the Southern and lower Midwestern United States. They differ from the Deep South and Atlantic coastal plain by terrain, history, econom ...
increased from less than 1 percent to nearly 10 percent between 1790 and 1810 as a result of these actions.Wilson, ''Black Codes'' (1965), p. 15. "By 1775, inspired by those 'self-evident' truths which were to be expressed by the
Declaration of Independence A declaration of independence or declaration of statehood or proclamation of independence is an assertion by a polity in a defined territory that it is independent and constitutes a state. Such places are usually declared from part or all of th ...
, a considerable number of colonists felt that the time had come to end slavery and give the free Negroes some fruits of liberty. This sentiment, added to economic considerations, led to the immediate or gradual abolition of slavery in six northern states, while there was a swelling flood of private manumissions in the South. Little actual gain was made by the free Negro even in this period, and by the turn of the century, the downward trend had begun again. Thereafter the only important change in that trend before the Civil War was that after 1831 the decline in the status of the free Negro became more precipitate."
The establishment of the Northwest Territory as "free soil"—no slavery—by
Manasseh Cutler Manasseh Cutler (May 13, 1742 – July 28, 1823) was an American clergyman involved in the American Revolutionary War. He was influential in the passage of the Northwest Ordinance of 1787 and wrote the section prohibiting slavery in the Nort ...
and
Rufus Putnam Brigadier-General Rufus Putnam (April 9, 1738 – May 4, 1824) was an American military officer who fought during the French and Indian War and the American Revolutionary War. As an organizer of the Ohio Company of Associates, he was instrumenta ...
(who both came from Puritan New England) would also prove crucial. This territory (which became the states of Ohio, Michigan, Indiana, Illinois, Wisconsin and part of Minnesota) doubled the size of the United States. In the decades leading up to the Civil War, abolitionists, such as
Theodore Parker Theodore Parker (August 24, 1810 – May 10, 1860) was an American transcendentalist and reforming minister of the Unitarian church. A reformer and abolitionist, his words and popular quotations would later inspire speeches by Abraham Lincol ...
,
Ralph Waldo Emerson Ralph Waldo Emerson (May 25, 1803April 27, 1882), who went by his middle name Waldo, was an American essayist, lecturer, philosopher, abolitionist, and poet who led the transcendentalist movement of the mid-19th century. He was seen as a champ ...
, Henry David Thoreau and
Frederick Douglass Frederick Douglass (born Frederick Augustus Washington Bailey, February 1817 or 1818 – February 20, 1895) was an American social reformer, abolitionist, orator, writer, and statesman. After escaping from slavery in Maryland, he became ...
, repeatedly used the Puritan heritage of the country to bolster their cause. The most radical anti-slavery newspaper, '' The Liberator,'' invoked the Puritans and Puritan values over a thousand times. Parker, in urging New England congressmen to support the abolition of slavery, wrote, "The son of the Puritan . . . is sent to Congress to stand up for Truth and Right." Literature served as a means to spread the message to common folks. Key works included ''
Twelve Years a Slave ''Twelve Years a Slave'' is an 1853 memoir and slave narrative by American Solomon Northup as told to and written by David Wilson. Northup, a black man who was born free in New York state, details himself being tricked to go to Washington, D. ...
'', the ''Narrative of the Life of Frederick Douglass'', '' American Slavery as It Is'', and the most important: ''
Uncle Tom's Cabin ''Uncle Tom's Cabin; or, Life Among the Lowly'' is an anti-slavery novel by American author Harriet Beecher Stowe. Published in two volumes in 1852, the novel had a profound effect on attitudes toward African Americans and slavery in the U ...
'', the best-selling book of the 19th century aside from the Bible."The Sentimental Novel: The Example of Harriet Beecher Stowe" by Gail K. Smith, ''The Cambridge Companion to Nineteenth-Century American Women's Writing'' by Dale M. Bauer and Philip Gould, Cambridge University Press, 2001, p. 221
Book preview
.
A more unusual abolitionist than those named above was Hinton Rowan Helper, whose 1857 book, ''
The Impending Crisis of the South ''The Impending Crisis of the South: How to Meet It'' is an 1857 book by Hinton Rowan Helper, who declares himself a proud Southerner. It was written mostly in Baltimore, but it would have been illegal to publish it there, as he pointed out. It wa ...
: How to Meet It'', " en more perhaps than ''Uncle Tom's Cabin'' ... fed the fires of sectional controversy leading up to the Civil War." A Southerner and a virulent racist, Helper was nevertheless an abolitionist because he believed, and showed with statistics, that slavery "impeded the progress and prosperity of the South, ... dwindled our commerce, and other similar pursuits, into the most contemptible insignificance; sunk a large majority of our people in galling poverty and ignorance, ... ndentailed upon us a humiliating dependence on the Free States...." By 1840 more than 15,000 people were members of abolitionist societies in the United States. Abolitionism in the United States became a popular expression of
moralism Moralism is any philosophy with the central focus of applying moral judgements. The term is commonly used as a pejorative to mean "being overly concerned with making moral judgments or being illiberal in the judgments one makes". Moralism has s ...
, and led directly to the Civil War. In churches, conventions and newspapers, reformers promoted an absolute and immediate rejection of slavery. Support for abolition among the religious was not universal though. As the war approached, even the main denominations split along political lines, forming rival Southern and Northern churches. For example, in 1845 the Baptists split into the Northern Baptists and
Southern Baptists The Southern Baptist Convention (SBC) is a Christian denomination based in the United States. It is the world's largest Baptist denomination, and the largest Protestant and second-largest Christian denomination in the United States. The wo ...
over the issue of slavery. Abolitionist sentiment was not strictly religious or moral in origin. The Whig Party became increasingly opposed to slavery because it saw it as inherently against the ideals of capitalism and the free market. Whig leader
William H. Seward William Henry Seward (May 16, 1801 – October 10, 1872) was an American politician who served as United States Secretary of State from 1861 to 1869, and earlier served as governor of New York and as a United States Senator. A determined oppon ...
(who would serve as Lincoln's secretary of state) proclaimed that there was an "irrepressible conflict" between slavery and free labor, and that slavery had left the South backward and undeveloped. As the Whig party dissolved in the 1850s, the mantle of abolition fell to its newly formed successor, the Republican Party.


Territorial crisis

Manifest destiny heightened the conflict over slavery. Each new territory acquired had to face the thorny question of whether to allow or disallow the "peculiar institution". Between 1803 and 1854, the United States achieved a vast expansion of territory through purchase, negotiation, and conquest. At first, the new states carved out of these territories entering the union were apportioned equally between slave and free states. Pro- and anti-slavery forces collided over the territories west of the Mississippi. The
Mexican–American War The Mexican–American War, also known in the United States as the Mexican War and in Mexico as the (''United States intervention in Mexico''), was an armed conflict between the United States and Mexico from 1846 to 1848. It followed the 1 ...
and its aftermath was a key territorial event in the leadup to the war. As the
Treaty of Guadalupe Hidalgo The Treaty of Guadalupe Hidalgo ( es, Tratado de Guadalupe Hidalgo), officially the Treaty of Peace, Friendship, Limits, and Settlement between the United States of America and the United Mexican States, is the peace treaty that was signed on 2 ...
finalized the conquest of northern Mexico west to
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
in 1848, slaveholding interests looked forward to expanding into these lands and perhaps Cuba and Central America as well. Prophetically, Ralph Waldo Emerson wrote that "Mexico will poison us", referring to the ensuing divisions around whether the newly conquered lands would end up slave or free. Northern free-soil interests vigorously sought to curtail any further expansion of slave territory. The
Compromise of 1850 The Compromise of 1850 was a package of five separate bills passed by the United States Congress in September 1850 that defused a political confrontation between slave and free states on the status of territories acquired in the Mexican–Am ...
over California balanced a free-soil state with a stronger federal fugitive slave law for a political settlement after four years of strife in the 1840s. But the states admitted following
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
were all free: