Wannbe, you may want to do more research.
Here are some more facts.
Following the work of campaigners in the United Kingdom, the Abolition of the Slave Trade Act was passed by Parliament on March 25, 1807. The act imposed a fine of £100 for every slave found aboard a British ship.
The Slavery Abolition Act, passed on August 23, 1833, outlawed slavery itself in the British colonies. On August 1, 1834 all slaves in the British Empire were emancipated, but still indentured to their former owners in an apprenticeship system which was finally abolished in 1838.
In 1772, a legal case concerning James Somersett made it illegal to remove a slave from
England against his will.
There were slaves in mainland France, but the institution was never fully authorized there. However, slavery was vitally important in France's Caribbean possessions, especially Saint-Domingue.
The Lesser Antilles islands of Barbados, Antigua, Martinique and Guadeloupe were the first important slave societies of the Caribbean, switching to slavery by the end of the 16th century as their economies converted from tobacco to sugar production. By the middle of the 18th century, British Jamaica and French Saint-Domingue had become the largest and most brutal slave societies of the region, rivaling Brazil as a destination for enslaved Africans.
The first announcement from Whitehall in England that slaves would be totally freed by 1840 was made in 1833. In the meantime, slaves on plantations were expected to remain were they were and work as "apprentices" for the next six years. On 1st of August 1834, a unarmed group of mainly elderly negroes being addressed by the Governor at Government House about the new laws, began chanting: "Pas de six ans. Point de six ans" ("Not six years. No six years"), drowning out the voice of the Governor. Peaceful protests continued until a resolution to abolish apprenticeship was passed and de facto freedom was achieved. Full emancipation for all was finally legally granted ahead of schedule on 1st August, 1838, making Trinidad the first British colony with slaves to completely abolish slavery.
After British abolished slavery, they began to pressure other nations to do the same. France, too, abolished slavery, but by this point St. Domingue had already broken away to form the independent Republic of Haiti. French islands were limited to the Lesser Antilles.
So as you can see, it existed even in the UK and France till they abolished slavery.
Cheers, Thorgrimm