A person who opposed the abolition of slavery, especially during the 19th century in the United States and Europe.
From 'anti-' (against) + 'abolitionist' (one who seeks to abolish something, from Latin 'abolere' meaning to destroy), coined in the 18th-19th centuries.
Antiabolitionists weren't just defending slavery—many actually wrote books arguing it was natural and biblical, making them tragic examples of how intelligent people can rationalize immoral systems when they profit from them.
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