i don't know about the following but a well known euphemism for slavery is the "peculiar institution"
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Our) peculiar institution
The "Peculiar Institution" was and remains a common euphemism for slavery in the U.S. southern slave states. People to this day will speak of "the South's Peculiar Institution" as a way of referring to slavery without actually using the word "slavery."
cotton gin
Slavery wasn't just "weakened" after the Civil War. Slavery was abolished by the Civil War, and by President Lincoln's Emancipation Proclamation.
slaves working in towns and citys