Prior to the advent of steam, farms across the Great Plains were powered by flesh-and-blood horsepower. Horses and mules did the work. This form of horsepower came with many disadvantages. The average farm was 100 acres. A farmer walked countless miles to plow his fields behind a walking plow, and walked even more to plant and cultivate the crops. The animals had to be fed and cared for year-round, even when they weren’t working, adding additional expense.