As a man who has spent MANY hours on a tractor, I am well aware of what is required of farming.
My views are not erroneous- they take something more into account than just 'slavery is evil and the south had slavery.' They ignore the technology and science that was coming into agriculture in the late 1800s, and automatically assume that the South would have disdained the less expensive, more efficient ways in favor off maintaining an expensive, massively dangerous institution. People assume that slavery was so entrenched that the South would have never gotten away from it; it is, as I said, because the South didn't meet the mitigating circumstance of victory.
P.S. labourers - What part of the Europe?
You cannot argue that slavery would magically 'become uneconomical" when I can cite the exact same "economic arguments" for slavery repeated in the modern day - albeit in regard to illegal Mexican labourers.
LOL... actually, what you are suggesting is WAGE SLAVERY- a far more efficient system,
as it is what the North used to beat the South.
Wage slavery > Chattel slavery, because the 'employer' has less expense as opposed to the 'owner.' Chattel slavery was hideously inefficient- a 10% profit margin on slave labor vs a 40% (lowball figure) for most paid labor enterprises. What, if any, reason do you have to continue with the inefficient system once you begin developing the mechanical aids which replace the necessary laborers? There is no reason- in fact, the 'reason' dictates a switch to wage-slavery.
Breaking ground is the longest and most tedious part of farming with a mule. Planting can be done over a larger area in a shorter period of time, and so can picking. Breaking ground, however, can only proceed at a finite rate due to availability of rather expensive equipment and necessity of time and distance which the animal can work over.
Planting/harvesting goes VERY quickly compared to breaking ground. Even hand-harvesting something like maize (you have no idea how bad I wanted to type corn) is much faster... I know as I have done it.
Mechanical breaking, however, inverts this and makes breaking ground much faster. 3 men, 3 stokers and a blacksmith + assistant on standby can now break more ground in a day than an equal number of men and mules can break in several. The best part is that only two of these men are actually 'skilled labor'- the blacksmith and apprentice. The other two men are men who need only limited teaching and can be hired and released as necessary- and they replace dozens of men who required a great deal more skill (plowing with a mule is an art, and novices need a lot of teaching). The beginnings of internal combustion tractors by 1900 makes the necessary teaching for operators even lower- you pull the 'go handle' and drive with the contours of the land.