The abolition of slavery occurred at different times in different countries. It frequently occurred sequentially in more than one stage - for example, as abolition of the trade in slaves in a specific country, and then as abolition of slavery throughout empires. Each step was usually the result of a separate law or action. This timeline shows abolition laws or actions listed chronologically.
This article also covers the abolition of serfdom.
Although slavery is now abolished de jure in all countries, some practices akin to it continue today in many places throughout the world.
N.B.: Many of the listed reforms were reversed over succeeding centuries.
Abolition of slavery timeline Wikipedia