History of Slavery in Alabama (1819-1865) By ChristyJordan Period: Jan 1, 1819 to Dec 31, 1865 History of Alabama Slavery (1819-1865) Oct 6, 1819 Slaves accounted for more than 30% of Alabama's approximate 128,000 inhabitants Apr 24, 1830 Slave population had quadrupled in size Aug 24, 1852 Alabama Slave Code made voluntary manslaughter of a white person by a slave a capital offense Jan 31, 1865 13th Ammendment abolished slavery in the United States