The most important was the horse collar, which was like turbocharging a tractor. The use of horses to farm also exemplified the class changes. Horses didnt di

The most important was the horse collar, which was like turbocharging a tractor. The use of horses to farm also exemplified the class changes. Horses didnt die of plague. Thier owners sure did. So the horse became cheaper and lesser classes of people put them to uses that previously would have been benieth thier dignity.