1. proslavery - Noun
2. proslavery - Adjective
Favoring slavery.
Advocacy of slavery.
Source: Webster's dictionaryThe Fifth Amendment's Just Compensation clause provided the proslavery camp with a bastion for fortifying the peculiar institution against congressional restrictions to its spread westward. Source: Internet
Under the "Jefferson-Lemen compact", Jefferson donated money to Lemen to found churches in Illinois and Indiana to stop the proslavery movement. Source: Internet