Which group was the first sizable political organization formed by US farmers?

The first sizable political organization formed by U.S. farmers was the Grange, officially known as the Patrons of Husbandry, established in 1867. The Grange sought to address the economic challenges faced by farmers, promoting cooperative buying and selling, as well as advocating for agricultural education and rural community development. It played a significant role in advancing farmers' interests and influenced subsequent movements, including the Populist Party.