When Did Mauritania Abolish Slavery?

In 1981, Mauritania became the last country in the world to abolish slavery, when a presidential decree abolished the practice. However, no criminal laws were passed to enforce the ban. In 2007, "under international pressure", the government passed a law allowing slaveholders to be prosecuted.

What was the first country to abolish slavery?

Haiti (then Saint-Domingue) formally declared independence from France in 1804 and became the first sovereign nation in the Western Hemisphere to unconditionally abolish slavery in the modern era.

Which country abolished slavery last?

Mauritania is the world's last country to abolish slavery, and the country didn't make slavery a crime until 2007. The practice reportedly affects up to 20% of the country's 3.5 million population (pdf, p. 258), most of them from the Haratin ethnic group.