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Abolitionism

Main article: Abolitionism
See also: Abolition of slavery timeline
The painting of the 1840 Anti-Slavery Society Convention at Exeter Hall. Move your cursor to identify delegates or click the icon to enlarge.[169]

Slavery has existed, in one form or another, through the whole of recorded human history — as have, in various periods, movements to free large or distinct groups of slaves.

The Greek Stoics advocated the brotherhood of humanity and the natural equality of all human beings, and consistently critiqued slavery as against the law of nature.[170] Emperor Wang Mang abolished slave trading (although not slavery) in China in 9 CE.[171]

The Spanish colonization of the Americas sparked a discussion about the right to enslave native Americans. A prominent critic of slavery in the Spanish New World colonies was Bartolomé de las Casas, who opposed the enslavement of Native Americans, and later also of Africans in America.

One of the first protests against the enslavement of Africans came from German and Dutch Quakers in Pennsylvania in 1688. One of the most significant milestones in the campaign to abolish slavery throughout the world occurred in England in 1772, with British judge Lord Mansfield, whose opinion in Somersett's Case was widely taken to have held that slavery was illegal in England. This judgement also laid down the principle that slavery contracted in other jurisdictions (such as the American colonies) could not be enforced in England.[172] In 1777, Vermont became the first portion of what would become the United States to abolish slavery (at the time Vermont was an independent nation). In 1794, under the Jacobins, Revolutionary France abolished slavery.[173] There were celebrations in 2007 to commemorate the 200th anniversary of the Abolition of the slave trade in the United Kingdom through the work of the British Anti-Slavery Society.

Joseph Jenkins Roberts, born in Virginia, was the first president of Liberia, which was founded in 1822 for freed American slaves.

William Wilberforce received much of the credit although the groundwork was an anti-slavery essay by Thomas Clarkson. Wilberforce was also urged by his close friend, Prime Minister William Pitt the Younger, to make the issue his own, and was also given support by reformed Evangelical John Newton. The Slave Trade Act was passed by the British Parliament on 25 March 1807, making the slave trade illegal throughout the British Empire, Wilberforce also campaigned for abolition of slavery in the British Empire, which he lived to see in the Slavery Abolition Act 1833. After the 1807 act abolishing the slave trade was passed, these campaigners switched to encouraging other countries to follow suit, notably France and the British colonies. In 1839, the world's oldest international human rights organization, Anti-Slavery International, was formed in Britain by Joseph Sturge, which campaigned to outlaw slavery in other countries.[174]

Between 1808 and 1860, the British West Africa Squadron seized approximately 1,600 slave ships and freed 150,000 Africans who were aboard.[175] Action was also taken against African leaders who refused to agree to British treaties to outlaw the trade, for example against "the usurping King of Lagos", deposed in 1851. Anti-slavery treaties were signed with over 50 African rulers.[176]

Three people in chains, probably somewhere in East-Africa. By 1900, slaves comprised up to one-third of Ethiopia's population.[177] Emperor Haile Selassie officially abolished slavery in 1942.

In the United States, abolitionist pressure produced a series of small steps towards emancipation. After January 1, 1808, the importation of slaves into the United States was prohibited,[178] but not the internal slave trade, nor involvement in the international slave trade externally. Legal slavery persisted; and those slaves already in the U.S. were legally emancipated only in 1863. Many American abolitionists took an active role in opposing slavery by supporting the Underground Railroad. Violence soon erupted, with the anti-slavery forces led by John Brown, and Bleeding Kansas, involving anti-slavery and pro-slavery settlers, became a symbol for the nationwide clash over slavery. By 1860 the total number of slaves reached almost four million, and the American Civil War, beginning in 1861, led to the end of slavery in the United States.[179]

In 1863 Lincoln issued the Emancipation Proclamation, which freed slaves held in the Confederate States; the