Iron agricultural tools began to be used in the United States during the early 19th century. The transition from wooden and stone tools to iron tools marked a significant advancement in agricultural productivity. This shift was primarily driven by the Industrial Revolution, which brought about technological innovations and the mass production of iron tools.

The use of iron agricultural tools gained traction in the United States due to several factors. Firstly, the availability of abundant iron ore deposits in the country facilitated the production of iron tools. The discovery of the Mesabi Iron Range in Minnesota in the late 19th century further bolstered the domestic iron industry. Secondly, the introduction of new farming techniques, such as the plow, required stronger and more durable tools than those made of wood or stone. Iron tools were capable of handling the demands of large-scale farming operations, which were becoming increasingly common in the United States.

Historical data supports the widespread adoption of iron agricultural tools. For instance, the U.S. Census of Agriculture in 1850 reported that 70% of farms used iron plows, compared to just 30% in 1840. This indicates a rapid increase in the use of iron tools during the 1840s. Additionally, the rise of the agricultural machinery industry in the 19th century further contributed to the popularity of iron tools. Companies like the McCormick-Deering Company produced high-quality iron plows and other agricultural implements that were widely adopted by farmers.

The use of iron agricultural tools had a profound impact on American agriculture. These tools were more efficient, durable, and capable of handling larger plots of land, which led to increased crop yields and the expansion of agricultural production. This, in turn, contributed to the growth of the American economy and the development of the nation's infrastructure. The widespread adoption of iron tools also paved the way for further technological advancements in agriculture, setting the stage for the modern agricultural industry.