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The growth of humanitarian feeling during the Age of Enlightenment in the 18th cent., the spread of the ideas of Jean Jacques Rousseau and others, and the increase of democratic sentiment led to a growing attack on the slave trade. The French Revolution had a great effect not only in the spread of agitation for human rights but more directly in the uprisings in Saint-Domingue and the establishment of Haitian independence. The movement for the abolition of slavery progressed slowly in the United States during the 18th and the first half of the 19th cent. Each of the Northern states gradually abolished the practice, but the prohibition of foreign slave trade promised in the Constitution (ratified in 1789) was not realized until 1808.
In Great Britain
British humanitarians who had incorporated the abolition of slavery into their conception of Christianity labored successfully to outlaw (1807) the British slave trade. These same men, especially William Wilberforce, Thomas Clarkson, Zachary Macaulay, and Lord Brougham (Henry Peter Brougham), continued to work for the abolition of slavery throughout the British Empire, which was finally effected with the Abolition Act of 1833. However, according to some writers, the British, in abolishing slavery, were primarily motivated by economic, not humanitarian, interests. These critics argued th produced great wealth under the mercantilist system, it became unprofitable with the rise of industrial capitalism, which displaced mercantilism early in the 19th cent. At any rate, the abolition legislation of 1833 was followed by the gradual abolition of slavery in all lands under British control, principally by the device of invalidating the legality of slavery and removing its legal safeguards, usually by recompensing the owners.
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