noun

the action of making someone a slave; subjugation.

the enslavement of millions of Africans

subjugation,disenfranchisement,suppression,tyranny,subjection,oppression,domination,exploitation,persecution,slavery,servitude,bondage,forced labour,bonds,chains,fetters,shackles,restraints,yoke,dulosis,thraldom,thrall,serfdom,vassalage,helotage,helotry,helotism,enthralment,duress