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A slave state was a U.S. state which had legal slavery of African Americans. Slavery was one of the causes of the American Civil War and was abolished by the Emancipation Proclamation of 1863 and the Thirteenth Amendment of the United States Constitution in 1865.

Contents 1 States 2 Original status 2.1 Northern slave states 3 Conflict over new territories 3.1 Missouri Compromise 3.2 Status of Texas and the Mexican Cession states 3.3 Last battles 3.4 Slave and free state pairs 4 End of slave states 5 See also 6 References 7 External links

The 15 slave states at the time of the Civil War were Alabama, Arkansas, Delaware, Florida, Georgia, Kentucky, Louisiana, Maryland, Mississippi, Missouri, North Carolina, South Carolina, Tennessee, Texas, and Virginia (including West Virginia). (The District of Columbia also had slavery prior to the Civil War.) The last northern state to abolish slavery was New Jersey in 1804, although the laws of that state retained slaves over a certain age as "apprentices for life" until the 13th Amendment.

All but five of these states seceded in 1860 and 1861 to form the Confederate States of America; Delaware, Kentucky, Maryland and Missouri did not leave the Union. Though not a state, slavery was practiced in the Nebraska Territory as early as the 1850s. West Virginia joined the Union as a slave state in 1863 after seceding from Virginia.

Prior to the American Revolution, all of the British North American colonies had slavery, but the Revolutionary War gave impetus to a general antislavery 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 statutes required gradual emancipation.

Significant dates	VT	PA	MA	NH	CT	RI	NY	NJ
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	1783	1784	1784	1799	1804
Actual end of slavery	1777	c.1845	1783	c.1845?	1848	1842	1827	1865

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.

Controversy over whether Missouri 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 Maine as a free state was secured to balance Missouri's admission as a slave state.

The admission of Texas 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, California 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. Thus, the admission of California increased the anxiety of pro-slavery politicians but did not change the balance in the senate.

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 Cuba and to annex Nicaragua—both to be slave states. In 1854, the Missouri Compromise of 1820 was repealed, and an effort was initiated to organize Kansas as a slave state. Kansas was paired with Minnesota 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 Oregon in 1859.

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
Delaware	1787	New Jersey (Slave until 1804)	1787
Georgia	1788	Pennsylvania	1787
Maryland	1788	Connecticut	1788
South Carolina	1788	Massachusetts	1788
Virginia	1788	New Hampshire	1788
North Carolina	1789	New York (Slave until 1799)	1788
		Rhode Island	1790
Kentucky	1792
Tennessee	1796	Vermont	1791
Louisiana	1812	Ohio	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 was to be preserved, and were typically admitted in pairs:

Slave States	Year	Free States	Year
Mississippi	1817	Indiana	1816
Alabama	1819	Illinois	1818
Missouri	1821	Maine	1820
Arkansas	1836	Michigan	1837
Florida	1845	Iowa	1846
Texas	1845	Wisconsin	1848
		California (One pro-slavery Senator)	1850
Kansas (Blocked)		Minnesota	1858
		Oregon	1859
		Kansas	1861

Maryland 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 seceded.

• Free state
• Border states (Civil War)

• Don E. Fehrenbacher and Ward M. Mcafee; The Slaveholding Republic: An Account of the United States Government's Relations to Slavery (2002)

• Slavery in the North