England banned the slave trade in 1807 (capturing men and women in Africa and transporting them to America for sale) and, 26 years later, abolished slavery out of a mix of humanitarian sentiments, led by the London Anti-Slavery Society (founded in 1823 ), and by the conviction that in the midst of the First Industrial Revolution, workers were cheaper and more productive than slaves.
From this moment on, the English Navy dedicated itself to the coasts of Africa to pursue and capture slave ships transporting slaves to America. This police work became a prosperous business, due to the capture of slave ships, for the English Crown.
In 1822 the American Colonization Society established the territory of Liberia as the place to send free African American slaves from the United States. Twenty-five years later the Republic of Liberia was founded. In France, the National Convention decreed the end of slavery in 1794. However, Napoleon Bonaparte would restore it in 1802.
In 1848 the Second French Republic abolished slavery in its colonies. The United States banned trafficking in 1808, although the end of slavery did not come until the Union's victory in 1865 over the Confederate territories in the Civil War (1861-1865). After numerous struggles and debates, slavery was completely abolished in Spain in 1886. In 1888, the end of slavery was enacted in Brazil, making it the last country in Latin America to abolish it.
The abolition of trafficking changed the slave market in America: English, French, Spanish, Peruvian, North American... they began to look in Asia, in China, who signed contracts to work for an average of ten years in these nations without being aware. that they were voluntarily sentencing their slavery for a limited time.