I don’t know, there were no power tools or heavy machinery in 1865. It was mainly Christian values that ended slavery in America, beginning with the Underground Railroad. When some refer to slavery being in the Bible, that was nothing like what you see in most parts of the world. Even in ancient Greece, not too far from ancient Israel, slaves had no rights at all. In ancient Israel slavery was mostly by choice, and there were rules governing fair treatment and a path to freedom.
And keep in mind that a Christian started the Abolitionist movement: an English reverend named William Wilberforce, in 1773.