Final answer:
The Grange and the subtreasury plan of the Farmers' Alliance were significant movements in helping farmers create co-ops, negotiate crop prices, and stabilize commodity markets with federal support for storage facilities and loans.
Step-by-step explanation:
The organization which helped farmers create local co-ops to buy storage facilities and negotiate crop prices was pioneered by the Patrons of Husbandry, known as the Grange. This initiative, started by Oliver Hudson Kelly in 1867, aimed to empower farmers to pool resources for better shipping rates and prices on agricultural inputs. Furthermore, one of the most significant efforts was the subtreasury plan, proposed by the Farmers' Alliance, which envisioned the federal government providing subsidized warehouses for grain storage and immediate loans to farmers, thereby stabilizing commodity prices and aiding debt-ridden farmers.
The Grange's establishment led to millions of members joining and represented a turning point in farmer organization and cooperation. The subtreasury plan was particularly innovative, providing a federal system of warehousing and financial support that allowed farmers to regulate market supply and potentially increase crop prices. Despite the push for these reforms, many efforts to establish such storage ran into difficulties due to widespread farmer debt, until later movements, meetings, and government programs further advanced agricultural support mechanisms.