The Abolition of Slavery Act, passed by the British Parliament in 1833, came into force on August 1, 1834.
The fine print: As an imperial statute, the Slavery Abolition Act liberated less than 50 enslaved Africans in British North America. For most enslaved people in British North America, however, the Act resulted only in partial liberation, as it only emancipated children under the age of six, while others were to be retained for four to six years as apprentices.

Legalized slavery continued in the United States until the 13th Amendment was passed on January 1, 1865.