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The slave and non-slave states as of 1861, with non-slave states in red and slave states in blue.

In the United States of Americamarker prior to the American Civil War, a slave state was a U.S. state in which slavery of African Americans was legal, whereas a free state was one in which slavery was either prohibited or eliminated over time. Slavery was one of the causes of the American Civil War and was abolished by the Thirteenth Amendment of the United States Constitution in 1865.


The Northeastern and Mid-Atlantic States, including Massachusettsmarker, New Yorkmarker, Pennsylvaniamarker and New Jerseymarker, had legally sanctioned slavery in the 17th, 18th and even part of the 19th centuries, but in the generation or two before the American Civil War, almost all slaves had been emancipated through a series of statutes.

The first U.S. region entirely free of slavery was the Midwest, which was ordained free under the Northwest Ordinance of 1787, passed just before the U.S. Constitution was ratified. The states created from this region—Ohiomarker, Indianamarker, Michiganmarker, Illinoismarker, Wisconsinmarker and Minnesotamarker —were generally settled by New Englandersmarker and American Revolutionary War veterans granted land there. Because this region was entirely slave free from its inception and separated by the Ohio River from the South—which was pushing an expansion of legal slavery into the West—the concept developed of "free states" in contrast to "slave states." The rural Midwest, at one time in direct East-West rivalry with the Northeastern commercial states, realigned with the Northeastern states, newly free of slavery and together created the amalgamation of states prohibiting slavery, known in the context of the Civil War as the free states.

Anti-slavery settlers in "Bleeding Kansas" in the 1850s were called Free-Staters, because they fought (successfully) to include Kansas in the Union as a free state.

At the beginning of the Civil War, the 19 free states were as follows: Mainemarker, Vermontmarker, New Hampshiremarker, Massachusettsmarker, Rhode Islandmarker, Connecticutmarker, New Yorkmarker, New Jerseymarker, Pennsylvaniamarker, Ohiomarker, Indianamarker, Illinoismarker, Michiganmarker, Wisconsinmarker, Minnesotamarker, Kansasmarker, Iowamarker, Oregonmarker and Californiamarker. In New Jersey, there were still slaves at the time of the Civil War. New Jersey law called for the gradual emancipation of slaves, and by the time of the Civil War most but not all slaves in that state had been freed.


The 15 slave states at the time of the Civil War were Alabamamarker, Arkansasmarker, Delawaremarker, Floridamarker, Georgiamarker, Kentuckymarker, Louisianamarker, Marylandmarker, Mississippimarker, Missourimarker, North Carolinamarker, South Carolinamarker, Tennesseemarker, Texasmarker, and Virginiamarker (including West Virginiamarker which hadn't separated from Virginiamarker at that time). (The District of Columbiamarker also had slavery until April 16, 1862.) Though not states, slavery was practiced in the Nebraska Territory and in the Indian Territory (Oklahomamarker) as early as the 1850s. The last northern state to abolish slavery was New Jerseymarker in 1804, although the laws of that state retained slaves over a certain age as "apprentices for life" until the 13th Amendment in 1865, which in fact proved to be the actual end of slavery in New Jersey.

Eleven of these states declared their secession in 1860 and 1861 to form the Confederate States of America; Delaware, Kentucky, Maryland and Missouri did not leave the Union. West Virginiamarker joined the Union as a slave state in 1863 after agreeing to a gradual elimination of slavery after the Willey Amendment was added to the state constitution and ratified by popular vote on March 26, 1863.

Original state-based abolition efforts

Prior to the American Revolution, all of the British North American colonies had slavery, but the Revolutionary War gave impetus to a general anti-slavery sentiment. The Northwest Territory, now known as the Midwest, was organized under the Northwest Ordinance with a prohibition on slavery in 1787. Massachusetts accepted that its 1780 Constitution effectively abolished slavery, and several other northern states adopted statutes requiring gradual emancipation. In 1804, New Jersey became the last state to embark on the course of gradual emancipation.

Northern slave states

Significant dates VTmarker PAmarker MAmarker NHmarker CTmarker RImarker NYmarker NJmarker
European settlement 1666 1638 1620 1623 1633 1636 1624 1620
First record of slavery c.1760? 1639 1629? 1645 1639 1652 1626 1627
Official end of slavery 1777 1780 1783 1857 1784 1784 1799 1804
Actual end of slavery 1777 c.1845 1783 c.1845? 1848 1842 1827 1865

Conflict over new territories

During the War of 1812, the British promised emancipation to slaves that would support their side. By the end of the War of 1812, the momentum for antislavery reform, state by state, appeared to run out of steam, with half of the states having already abolished slavery (Northeast), prohibited from the start (Midwest) or committed to eliminating slavery, and half committed to continuing the institution indefinitely (South).

The potential for political conflict over slavery at a federal level led politicians to be concerned about the balance of power in the U.S. Senate, where each State was represented by two Senators. With an equal number of slave states and free states, the United States Senate was equally divided. As the population of the free states began to outstrip the population of the slave states, leading to control of the House of Representatives by free states, the Senate became the preoccupation of slave state politicians interested in maintaining a Congressional veto over federal policy in regard to slavery. As a result of this preoccupation, slave states and free states were often admitted into the Union in pairs to maintain the existing Senate balance between slave and free.

Missouri Compromise

Controversy over whether Missourimarker should be admitted as a slave State, resulted in the Missouri Compromise of 1820, which specified that Louisiana Purchase territory north of latitude 36° 30', which described Missouri's southern boundary, would be organized as free states and territory south of that line would be reserved for organization as slave states. As part of that compromise, the admission of Mainemarker as a free state was secured to balance Missouri's admission as a slave state.

Status of Texas and the Mexican Cession states

The admission of Texasmarker and the acquisition of vast new western territories after the Mexican-American War further excited controversy. Although the settled portion of Texas was an area rich in cotton plantations and dependent on slavery, the territory acquired in the Mountain West did not seem hospitable to cotton or slavery. In 1850, Californiamarker was admitted as a free state, without an additional slave state as balance. This would have created a free state majority in the Senate, except that California agreeably sent one pro-slavery and one anti-slavery senator to Washington, D.C.marker Thus, the admission of California increased the anxiety of pro-slavery politicians but did not change the balance in the senate.

Last battles

The difficulty of identifying any territory which could be organized into additional slave states stalled the process of opening the western territories to settlement, while slave state politicians sought a solution. Efforts were made to acquire Cubamarker and to annex Nicaraguamarker, both to be slave states. In 1854, the Missouri Compromise of 1820 was repealed, and an effort was initiated to organize Kansasmarker as a slave state. Kansas was paired with Minnesotamarker for admission, but the admission of Kansas as a slave state was blocked because of questions over the legitimacy of its slave state constitution. When the admission of Minnesota proceeded unimpeded in 1858, the balance in the Senate was lost; a loss that was compounded by the subsequent admission of Oregonmarker in 1859.

Slave and free state pairs

Before 1812, the concern about balancing slave-states and free states was not profound. This is how the states lined up in 1812:
Slave States Year Free States Year
Delawaremarker 1787 New Jerseymarker
(Slave until 1804)
Georgiamarker 1788 Pennsylvaniamarker 1787
Marylandmarker 1788 Connecticutmarker 1788
South Carolinamarker 1788 Massachusettsmarker 1788
Virginiamarker 1788 New Hampshiremarker 1788
North Carolinamarker 1789 New Yorkmarker
(Slave until 1799)
Kentuckymarker 1792 Rhode Islandmarker 1790
Tennesseemarker 1796 Vermontmarker 1791
Louisianamarker 1812 Ohiomarker 1803

Following 1812, and until the Civil War, maintaining the balance of free and slave states within the federal legislature was considered of paramount importance if the Union were to be preserved, and states were typically admitted in pairs:
Slave States Year Free States Year
Mississippimarker 1817 Indianamarker 1816
Alabamamarker 1819 Illinoismarker 1818
Missourimarker 1821 Mainemarker 1820
Arkansasmarker 1836 Michiganmarker 1837
Floridamarker 1845 Iowamarker 1846
Texasmarker 1845 Wisconsinmarker 1848
(One pro-slavery Senator)
Minnesotamarker 1858
Oregonmarker 1859
Kansasmarker 1861

End of slave states

Marylandmarker and the pro-Union government of Missouri abolished slavery during the Civil War. The Thirteenth Amendment to the United States Constitution, ratified December 6, 1865, abolished slavery throughout the United States, ending the distinction. Ratification of the 13th Amendment was a condition of the return of local rule to those states that had declared their secession.

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