What you said is not factual at all; it is speculation on your part. Now that is fine. History is full of "what ifs." But there is a difference between a reasoned estimate and a wild-assed guess or rank speculation.
We have, in the past, talked at length about farm equipment and agricultural mechanization. I don't believe you have made a case to support your contention about the imminent death of "chattel slavery" in the 1860's or 70's.