August, 1838
8/1: Slavery was declared unlawful throughout the British Empire. A combination of slave revolts, humanitarian concerns, and a growing industrialization in Great Britain led to the passage of the Abolition Act. The situation for slaves, however, changed little.   Belize was one of the British colonies where slavery was abolished:  http://www.belizenet.com/history/chap5.html
(source: The Learning Kingdom)