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The last forms of legal slavery were outlawed in 1970 in the Arabian countries, but hidden slavery still exists today in remote parts of Africa such as the [[Sudan]] where Arabs own black slaves.

The last forms of legal slavery were outlawed in 1970 in the Arabian countries, but hidden slavery still exists today in remote parts of Africa such as the [[Sudan]] where Arabs own black slaves.

The term "slavery" is often used metaphorically for sex workers who are controlled by pimps.

The term "slavery" is often used metaphorically for sex workers who are controlled by pimps.

Slavery was found in the history of most civilizations.  Slavery flourishes where there is a high demand for labor and not enough workers. When the workers are plentiful, slavery dies out because it is unprofitable. That is, it becomes cheaper to free a slave and hire low cost paid labor than to buy and maintain slaves.  Typically, when it had almost died out, it was made illegal by the government, as in Brazil.

In political writings, especially in [[Republicanism]], slavery is a highly negative term that means political control by an outside force.

==Economics==

==Economics==

The two main forms of slavery are house servants (in which slaves are luxury items owned by the rich), and field work, in which slaves are used as a cheap labor force.  If free labor is cheaper than expensive slaves, slavery will disappear.  If there is a shortage of laborers (and an abundance of work to do), slavery becomes economically possible. It is especially profitable in new lands with few people and rich soils or mines that require imported labor.

The two main forms of slavery are house servants (in which slaves are luxury items owned by the rich), and field work, in which slaves are used as a cheap labor force.  If free labor is cheaper than expensive slaves, slavery will disappear.  If there is a shortage of laborers (and an abundance of work to do), slavery becomes economically possible. It is especially profitable in new lands with few people and rich soils or mines that require imported labor.

For a long time, until the early 18th century, the Crimean Khanate maintained a massive slave trade with the [[Ottoman Empire]] and the Middle East. Kefe was one of the best known and significant trading ports and slave markets. In a process called "harvesting of the steppe" Crimean Tatars enslaved many Slavic peasants.

For a long time, until the early 18th century, the Crimean Khanate maintained a massive slave trade with the [[Ottoman Empire]] and the Middle East. Kefe was one of the best known and significant trading ports and slave markets. In a process called "harvesting of the steppe" Crimean Tatars enslaved many Slavic peasants.

[[Image:Boulanger Gustave Clarence Rudolphe The Slave Market.jpg|right|thumb|350px|Boulanger Gustave Clarence Rudolphe's painting ''The Slave Market'']]

[[Image:Boulanger Gustave Clarence Rudolphe The Slave Market.jpg|right|thumb|350px|Boulanger Gustave Clarence Rudolph's painting ''The Slave Market'']]

===Islam===

===Islam===

In Senegambia, between 1300 and 1900, close to one-third of the population was enslaved. In early [[Islamic]] states of the western Sudan, including Ghana (750-1076), Mali (1235–1645), Segou (1712–1861), and Songhai (1275-1591), about a third of the population were slaves. In [[Sierra Leone]] in the 19th century about half of the population consisted of slaves. In the 19th century at least half the population was enslaved among the Duala of the Cameroon, the [[Igbo]] and other peoples of the lower Niger, the [[Kingdom of Kongo|Kongo]], and the Kasanje kingdom and Chokwe of [[Angola]]. Among the Ashanti and Yoruba a third of the population consisted of slaves. The population of the [[Kanem]] was about a third-slave. It was perhaps 40% in Bornu (1396–1893). Between 1750 and 1900 from one- to two-thirds of the entire population of the Fulani jihad states consisted of slaves. The population of the Sokoto caliphate formed by Hausas in the northern [[Nigeria]] and Cameroon was half-slave in the 19th century. It is estimated that up to 90% of the population of [[Arab]]-Swahili Zanzibar was enslaved. Roughly half the population of [[Madagascar]] was enslaved.<ref>[http://www.britannica.com/blackhistory/article-24157 Welcome to Encyclopædia Britannica's Guide to Black History]</ref>

In Senegambia, between 1300 and 1900, close to one-third of the population was enslaved. In early [[Islamic]] states of the western Sudan, including Ghana (750-1076), Mali (1235–1645), Segou (1712–1861), and Songhai (1275-1591), about a third of the population were slaves. In [[Sierra Leone]] in the 19th century about half of the population consisted of slaves. In the 19th century at least half the population was enslaved among the Duala of the Cameroon, the [[Igbo]] and other peoples of the lower Niger, the [[Kingdom of Kongo|Kongo]], and the Kasanje kingdom and Choke of [[Angola]]. Among the Ashanti and Yoruba a third of the population consisted of slaves. The population of the [[Kanem]] was about a third-slave. It was perhaps 40% in Bornu (1396–1893). Between 1750 and 1900 from one- to two-thirds of the entire population of the Fulani jihad states consisted of slaves. The population of the Sokoto caliphate formed by Hausas in the northern [[Nigeria]] and Cameroon was half-slave in the 19th century. It is estimated that up to 90% of the population of [[Arab]]-Swahili Zanzibar was enslaved. Roughly half the population of [[Madagascar]] was enslaved.<ref>[http://www.britannica.com/blackhistory/article-24157 Welcome to Encyclopædia Britannica's Guide to Black History]</ref>

The Anti-Slavery Society estimated that there were 2 million slaves in [[Ethiopia]] in the early 1930s, out of an estimated population of between 8 and 16 million.<ref>[http://www.yale.edu/glc/events/cbss/Miers.pdf Twentieth Century Solutions of the Abolition of Slavery]</ref> Ethiopia officially abolished slavery and serfdom after regaining its independence in 1942. On August 26, 1942 [[Haile Selassie]] issued a proclamation outlawing slavery.<ref>[http://www.globalmarch.org/resourcecentre/world/ethiopia.pdf Ethiopia]; [http://www.geocities.com/Athens/Acropolis/2691/COS2.html Chronology of slavery]</ref>

The Anti-Slavery Society estimated that there were 2 million slaves in [[Ethiopia]] in the early 1930s, out of an estimated population of between 8 and 16 million.<ref>[http://www.yale.edu/glc/events/cbss/Miers.pdf Twentieth Century Solutions of the Abolition of Slavery]</ref> Ethiopia officially abolished slavery and serfdom after regaining its independence in 1942. On August 26, 1942 [[Haile Selassie]] issued a proclamation outlawing slavery.<ref>[http://www.globalmarch.org/resourcecentre/world/ethiopia.pdf Ethiopia]; [http://www.geocities.com/Athens/Acropolis/2691/COS2.html Chronology of slavery]</ref>