Answer:
The correct answer is the use of a new type of plow for the tough soil in the Midwest.
Step-by-step explanation:
John Deere was an american blacksmith and inventor during the nineteenth century who was famously known for inventing successfully the first commercial steel plow and later founded Deere & Company, one of the largest agricultural equipment manufacturers around the world.
Deere was born in Vermont but eventually moved to Illinois, there he acceded the labour market easily as a blacksmith and later in 1837 manufactured the cast-steel plow which was the ideal agricultural equipment for the tough soil in the Midwest and worked definitely better than the other plows. After a time, he began to sell his invention to the local farmers and made easy to work in the land that was previously known for imposible to work with.