proslavery

pro- +‎ slavery

proslavery (comparative more proslavery, superlative most proslavery)

1. Supporting slavery.
   • 1902, John Lord, Beacon Lights of History, Volume XII‎:

     By 1835 the excitement was at its height, and especially along the line of the moral and religious argumentation, where the proslavery men met talk with talk.

   • 1918, Carter G. Woodson, A Century of Negro Migration‎:

     When it seemed later that the cause of freedom would eventually triumph the proslavery element undertook to perpetuate slavery through a system of indentured servant labor.

proslavery (uncountable)

1. Belief that the institution of slavery is good
   • 1990, Larry E. Tise, Proslavery: A History of the Defense of Slavery in America, 1701-1840‎, page 308:

     The old wisdom that southerners rose up in unison in 1831 after a decade of preparation in the tenets of proslavery is patently an erroneous interpretation.