Pro-Slavery argument started in the late 1830's to early 1860's. The defenders of slavery argued that the end of slavery economy would have an emotional or changes and killing economic action in the South where trust on slave labor was the foundation of their economy. In 1837 John C. Calhoun made a speech in the U.S about the positive good theory of slavery and made his statement that slavery is not evil but a good-a positive good. A quotation from the website is: "everyone who supported slavery was free, everyone who supports abortion was born. That's how oppression works."