John Deere is credited as the inventor of the plow. He was an American blacksmith and manufacturer who lived in the early 19th century. He developed a cast-steel plow that was more durable than the traditional iron plow, which revolutionized farming in the United States. His invention allowed farmers to cultivate soil more efficiently and effectively, leading to increased crop yields. Deere's plow was so successful that it became the standard for plowing in the United States.